godzilla but it depends i think
ver the years Godzilla has possessed many powers and abilities to use against his foes. Godzilla is generally considered to be the most powerful kaiju, as is expressed by his title, King of the Monsters.
Godzilla's signature weapon is his distinctive atomic breath. Godzilla's dorsal fins glow ominously, and then he lets loose with a concentrated blast of radiation from his mouth. This power is commonly mistaken for breathing literal fire.
Godzilla has been shown apparently being able to adjust the intensity of his ray, varying from a blast of superheated vapor, such as in the 1950s and 1960s, to a beam with explosive and kinetic properties, in the 1970s and onward. The ray is usually portrayed as being neon blue, though in Godzilla 2000 and Godzilla vs. Megaguirus, it is a reddish orange to signify an increased level of power.
In Godzilla 2000 and Godzilla vs. Megaguirus, Godzilla's atomic breath was shown as having incendiary properties and was strong enough to destroy a miniature black hole, while in Godzilla: Final Wars, it possessed incredible range, amazing power and pin-point accuracy, able to hit a target in outer space and kill most kaiju with a single shot. In a memorable (and somewhat infamous) scene in Godzilla vs. Hedorah, Godzilla even used his atomic breath to fly by aiming it at the ground and lifting off like a rocket.
A variation of the standard atomic ray in the Heisei series was the red "spiral ray" which he acquired as a result of absorbing the Rodan's life energy. This ray was so powerful that only a few blasts of it were sufficient to completely destroy MechaGodzilla and SpaceGodzilla, though Destoroyah was able to withstand several hits. In Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack, a variant of his spiral ray was seen when King Ghidorah used his golden gravity beams on Godzilla. Godzilla was somehow able to draw strength from the gravity beams and used the absorbed energy to fire a blast of blue energy wrapped in a golden spiral that completely destroyed King Ghidorah. The spiral ray returned in Godzilla: Final Wars, where it was strong enough to push Keizer Ghidorah to the edge of space, destroying him in an explosion visible from the surface of the earth.
In the video game Godzilla: Save The Earth, Godzilla can also use a variation of his Atomic Breath called the Final Beam, a beam of energy that resembles his regular Atomic Breath except for the fact it is far more powerful and is purple in color. In Save The Earth he can also launch huge fireballs from his mouth as well.
In addition to his very deadly atomic breath, Godzilla can also emit atomic energy in all directions from every inch of his body in a short-range pulse. The pulse was first seen in his fight against Biollante. Godzilla only used the nuclear pulse in the Heisei series, although many consider the climactic scene in Godzilla 2000 to be a use of Godzilla's nuclear pulse; and also, Godzilla uses something similar to a nuclear pulse to prevent Keizer Ghidorah from draining any more of his energy from him after being surged with Ozaki's energy.
In the 1974 movie, Godzilla vs. MechaGodzilla, Godzilla found a way to generate powerful magnetic fields from his body after being struck several times by lightning, which proved devastating against his metallic foe. This is the only time Godzilla ever used this power.
In the 1993 Godzilla vs. MechaGodzilla 2, Godzilla demonstrated another ability that may have been a variant of his nuclear pulse. After being struck with MechaGodzilla's Shock Anchor harpoons, Godzilla discharged a form of energy up the cables, severely damaging the robot's internal mechanisms. However, this was not the only time Godzilla ever used this ability. In the succeeding film Godzilla vs. SpaceGodzilla, the King of the Monsters discharged energy through his physical blows in his offensive against the sinister space mutant SpaceGodzilla.
Godzilla has displayed an uncanny ability to sustain damage throughout his films.
Starting in the first Godzilla film, Godzilla displayed an immunity to conventional weaponry, virtually impervious to everything the JSDF threw at him. He has demonstrated the ability to survive complete submersion in magma for an extended period of time, sometimes while under extreme pressure from tectonic plates (as seen in Godzilla and Mothra: The Battle For Earth). He has even survived being in ground zero of asteroid impacts. The only times his flesh has been visibly pierced were in battle with the Super X, Shōwa Gigan, Biollante, King Ghidorah, Destoroyah, and from MechaGodzilla's weapons in the Showa, Heisei and Millennium series.
In addition to being extremely resistant to damage, Godzilla possesses an extremely advanced and highly efficient regenerative ability. This power was a crucial plot point of Godzilla vs Biollante and Godzilla 2000: Millennium. In Godzilla 2000, it is explained that Godzilla's regenerative abilities may have something to do with his radioactive properties, and Regenerator G-1 ("Organizer G-1" in the Japanese version) is the name given to a substance in his cells that is responsible for Godzilla's swift healing. In Godzilla vs Biollante, Japanese scientists use samples of the Godzilla cells (called G-cells throughout the Heisei series of Godzilla films) to help create the ANEB. This healing factor would be inherited by all creatures spawned from Godzilla's DNA, those being Biollante, SpaceGodzilla and Orga.
Godzilla has displayed varied levels of physical strength. He has been depicted lifting and throwing monsters in excess of his own weight, (such as King Ghidorah, Hedorah, MechaGodzilla and others), and in Godzilla: Final Wars was even able to throw Kumonga clear over the horizon. He is shown using various martial arts techniques in a comical fashion during the Shōwa Series, or moving very quickly in spite of his size, such as in Zone Fighter. In the millennium series he has also been able to leap high into the air.
Godzilla's long tail is also a formidable weapon. It has been shown to be very flexible and powerful, able to lash out quickly and topple over buildings and enemy monsters. In Godzilla vs. Megalon, he was able to slide on his tail a great distance to deliver a devastating kick, and in Godzilla vs. Megaguirus it was revealed to be prehensile as well. In all his incarnations he has been shown to have powerful jaws and sharp teeth and claws, although these are more prominent in some incarnations than in others. Rarely, Godzilla also showed the ability to use his dorsal fins as a weapon, such as in Godzilla vs. Megaguirus, when he uses their jagged tips to slice off Megaguirus' claw, and Godzilla vs. Hedorah, where he used them to cut into Hedorah during the flying scene. Also in Godzilla 2000 and Godzilla vs. Megaguirus, the fins create a tremendous amount of heat when the atomic ray is being prepared.
However, many of the films show Godzilla preferring to battle his opponents from a distance, particularly in the Heisei series; either by using his atomic breath, or by throwing objects like boulders at them.
Though not an amphibian, Godzilla has an amphibious lifestyle; he spends half of his life in water and the other on land to either wreak havoc or save the day. He is as adept a fighter underwater as he is on land. Capable of marching on the sea floor or swimming by undulating his tail like a crocodile, Godzilla is displayed as being able to breathe underwater (occasionally hibernating in the ocean depths between movies), and being submerged apparently does not impede his atomic ray, as seen in Godzilla vs. King Ghidorah. He engages opponents in the sea on multiple occasions, fighting King Ghidorah, Ebirah, Battra, Biollante and Mothra either beneath or on the surface of the waves.
The extent of Godzilla's intelligence varies throughout the character's history, but Godzilla is generally depicted as a thinking creature. The Showa incarnation in particular is depicted as being close in intelligence to a human, capable of abstract thought, and able to communicate with other monsters. Other versions of Godzilla display a simple animal cunning. Though the American-shot inserts from King Kong vs. Godzilla have little consistency with the timeline and rules of the Godzilla character in the Toho films, it may be worth mentioning that one of the American characters says that Godzilla has a brain about the size of a marble ("He's sheer brute force"); in comparison, the character states that Kong "Is a thinking animal." Again, this is largely inconsistent with Godzilla's character, although this is possibly done just to show Kong, being a primate would be be much more intelligent than Godzilla, who is a reptile.
In the Heisei series Godzilla reacts on animal cunning and instinct more consecutively than in his Showa counterpart, as demonstrated by his conditioned response in The Return of Godzilla. He was still capable of independent thought, however and according to Miki Saegusa of human-like sentiments as well. This was corroborated by his mourning the death of Godzilla Junior in Godzilla vs. Destoroyah. In Godzilla vs MechaGodzilla 2 he seems to destroy Mechagodzilla out of rage at Rodan's death. It was insinuated in Godzilla vs. King Ghidorah that he also remembers the distant past. The Heisei Godzilla was psychic on some level, possibly the most powerful in existence. His evasion of the JSDF in Godzilla vs. Biollante seemed to carry implications of precognition. Additionally, he had some manner of psychic link with Godzilla Junior and has several times demonstrated the ability to locate potential opponents from great distances.
Other examples of Godzilla's intelligence was displayed in Godzilla 2000 when he was facing Orga. When Orga kept regenerating himself in a fast pace, Godzilla decided to go after Orga's core and exploited that weakness thus defeating Orga.
Dang, composite Godzilla is the best, since he gets feats like fighting the Avengers, oh well. Aside from the absolute zero feat he also survived being inside of a black hole, a miniature one sure, but still pretty impressive. Godzilla's main attribute is his toughness and regen, it's how he beats guys like King Ghidorah who life-wiped an advanced civilization on Jupiter in one day, Godzillas cells also were able to survive in a real black hole in space, and the energy from the stars going supernova in the black hole was absorbed by Godzillas cells (its how Space Godzilla was born).
I'm not really sure how the Kings would hold up against nuclear radiation really, I can't really say who wins here, Godzilla has pretty good reactions himself, if he hits them with Atomic Breath the blast itself may not harm them too much but again, the radiation is a factor here, also I dont know how strong the current kings are, buuuut, I want to say they can win here, if they use something like Oshoku Bansan techniques to make sure he doesn't regen that is. For me this is a toss up