Vegeta has his legendary Big Bang Attack, which could take out the planet and that would probably be it for Wamuu. Wamuu has some powerful wind abilities, but they are far too slow to deal with the Prince of All Saiyans. Wamuu may have won his first battle, but he won’t be able to repeat that against this Super Saiyan. Vegeta has every possible combat advantage at his disposal. Vegeta wins.