Actually... Uh, something that just occurred to me.

Androids 17 and 18 have infinite energy and stamina.

In Dragon Ball, this means that all of their stats are infinite as strength, durability, speed, and everything else passed a certain point(that everyone was well past by the time they showed up) is a function of energy.

Piccolo fused with Kami was 17's equal and comparing feats even when 17 comes back more powerful in Super Goku is still stronger than him.

Kid Buu is also cited as possessing infinite energy and stamina, and this would logically also extend to Super Buu, who was surpassed easily by Gohan.

Gohan having just gotten back to the level he was on in that part of the Buu Saga, in the form he was in when he surpassed the strongest form of Buu, is roughly the Equal of KaiokenX10 SSJB Goku, meaing that end of Super Goku is equal too or stronger than someone who surpassed the strongest "infinite" being in his native universe.

So even if Superman is infinite, people who are finite have equaled or surpassed people who were infinite in Dragon Ball.