if goku didnt hit his head none of that stuff would have happened an vegeta would be stronger but in the new movie goku fought bills the god of destruction and he beat super sayin 3 goku with only one chop but vegeta acually hit bills in normal super sayin and made bills sweat only because he hit bulma
I don't know! Goku has (and still would) risk his life to save people he loves! Heck, he would probably risk his life for a stranger if Chi-Chi wouldn't stop him! He is funny, loving, and for those he loves and extremely strong. Vegeta is extremely strong too, but though he can very stubborn and headstrong, he still really cares about those he likes (plus, he sacrificed his life to kill Majjin Buu, for goodness sake!