>>279863711
Hard to say, SSJ3 Goku was as strong (if not stronger) than Fat Buu, who BTFO Majin Bejita, who in turn was on par with SSJ2 Goku. If we take as fact the speculation that SSJ Teen Gohan was actually a bit stronger than SSJ Goku (he thought Goku was holding back against Cell) , we can assume that SSJ2 Goku is more or less as strong as SSJ2 Gohan, maybe a bit weaker even, and the latter "won" against Hyper Perfect Cell.

That's an entirely different discussion in of itself, but judging from the feats I mentioned earlier, I believe SSJ3 Goku would win here.