Normal Thor tanked a Supernova with ease. I think he can handle a Solar system level attack just fine with Odinforce. Odin is beyond galaxy level and he levels galaxies as a side effect in his battle and was fighting on every plane of existence. Thor wielded the exact same power. Round 2 isn't even close. Odin also fought with universal+ beings Infinity and Galactus. The former he lost after a good fight and the latter was a double knockout. Dormammu also stated that Odin's power was equal to his own, the same guy the beat Eternity once with help and once solo and destroyed and recreated a universe. Again, author has the exact same power. Even normal Thor has feats beyond what Bills and Whis can hope to match. Not only dealing damage to Galactus a universe level being, once to the point of the latter fleeing from Thor, but visibly harming Amatsu Mikaboshi who had absorbed 98% of the multiverse. He also dealt the finishing blows to both Onslaught and Void (Onslaught was partly Hulk as well).