>>108241240Usagi.
Goku wants a good fight, so he absolutely will wait for Usagi to unleash her full potential so he can fight her at her strongest. This is his biggest and most consistent character flaw, and is something he does even when fighting people he absolutely wants dead so it still applies to death battle.
Which is a damn shame, because in terms of strength and speed Goku could easily destroy Usagi. But if he lets her 'power up' he literally cannot win, because its no longer a punching contest, its a reality rewriting contest.
One of the arcs of Sailor Moon ends with the good guys being unable to find the bad guys hiding on Earth, so they destroy the Earth and everything on it and then wish the Earth and everyone on it *who isn't the specific asshole they wanted dead* back to life.
For Goku to do anything like that, he would need a set of dragonballs and to play by the rules of the dragon. Sailor Moon can just do that shit herself with fucking moon magic. On top of that, Goku would never use a wish to defeat an opponent, because he wants to beat people with his own strength. Usagi has no compunctions about taking the easy way out of a conflict because she is lazy.