For me, what Whiz and BoomStick have stated are correct. Think about it for a second;
One man has the power to break any limit
One has no limits to begin with
Only one has limits to give it their all. That really has been the focal point of this debate long before Death Battle ever answered the question. Even now, there really shouldn't be any change. I am a fan of both, but for the DragonBall Z fans, much akin to what BoomStick asked, I will ask you this myself;
Would you really want a Goku who has reached a point where he is unbeatable?
" It has never been about acknowledgement when you achieve something. When you are acknowledged, then and only then can you achieve something. Always have your friends first to achieve your goals later." - OnlyForDisplay