@gokugx: If we go by that then Cooler murks, Vegeta was only marginally stronger than Goku at that point.
Meta Cooler bltizes with his IT combat speed
@gokugx: They aren't though, it's pretty obvious that Super Buu is superior to Goku, the latter has stated it multiple times. Cell and Frieza aren't "almost" equals either, they're worlds apart.
If X is larger than both Y and Z respectively, it doesn't tell us anything about the relationship of Y and Z, only that they are both less than X.
@gokugx: Super Buu is above Goku
I know Buutenks was toying with Goku and he can also toy with Super buu. That makes Goku and Super Buu almost in equal level.
Buu can toy with Cell and Frieza as well, that doesn't make them equal though
I can't pull up feats right now, but I can give you some background on Killy: He's a robot (won't run out of stamina), the city referred to was full of super structures that wouldn't be fazed by even a nuke, it should be noted in this series that city's can far larger than planets since the immense size of the dyson sphere they reside in, plus the guns only city level when it uses high AoE, when its concentrated it fires at lightspeed and should have country potency, to top it off Killy has lightspeed reactions and the durability to handle most of Toriko's attacks plus regeneration, still I'm not sure how he fares here.
@akronawol17: It isn't a normal hand gun, here's what the OBD put for it
Pitou only holds the speed advantage here and since Tommyrod can spam hundreds of lvl 30 insects I doubt he/she will be able to get close and even if he/she did manage to get in close, she probably wouldn't have the means to fatally wound him so in short Tommyrod should win this.
Are you asking why it's common for people to think DBZ is the strongest? To answer your question it's comes down to ignorance or Nostalgia, usually both.