Never really thought about it.
Superboy Prime (aka Superman Prime) is strong enough to rearrange planets and punch a hole through time.
Guys like Galactus and the Celestials are powerful enough to eat planets.
Thanos and Darkseid seem to be insanely strong but they never use their full power.
Doomsday beat the hell out of Darkseid in about a minute.
Imperiex blew Doomsday apart in about 5 seconds.
In the end, I guess it all comes down to the writer and who they want to be stronger at the time.








