In the original dialogue, Goku always says his attacks in perfect Japanese, while Vegeta has "Fainu Flash" and "Big Bangu attack!" Akira Toriyama wanted to represent how Goku was a classier act than Vegeta, more finesse and style.

That said -- WHERE'S MR. SATAN? We MUST HAVE MR. SATAN!

Ah, the Cell Game is almost here...