Ironman
Genius, Billionaire, Playboy, Philanthropist
I dont think Vegeta will defeat Granolah I think there's a bigger story at play here. I don't think Granolah will remain a villain much longer either.
I think Granolah accidentally destroys that city and gets shown "you're no better than the saiyans you hate if you would stoop to their level in this way" which is how I think they'll turn Granolah good.
I think Vegeta and Granolah fight and get interrupted by Oil and them. Granolah telling them about the new DragonBalls will also change a lot of things too.
Good point about the city they keep showing destruction getting closer