@dbzwnkkiller: You need to watch dbz again.
1. Frieza cut himself in half and then was blasted by Goku. The planet explosion only did minor damage to him while he was already out of power.
2. Vegeta hit Cell with his final flash not Buu.
Also Vegeta's final flash could be seen from space and would of easily destroyed the planet if it made contact.
However I agree Saitama does win this and he has better physical feats than dbz characters pre god level.