Rebounding seems like the best one to me, dominant rebounders in college generally do the same as pros. Shooting is one, free throw shooting most of all, but there's a lot of other factors involved there (Hunter for instance shot 35% from 3 in college, but I expect a higher number in the pros because he was always double teamed in college) Overall, defense seems to translate well. Things like scoring, FTA, assists and the like are more dependent on PT and offensive role.
We saw that a lot this year with Smart. He was option number 1, 2 and 3 at OK State, and he's a good driver who generates FT's and scored a lot. I'm Boston, he was option #4 or 5 and hardly had any plays called for him, so because he wasn't asked to do the things he did at OK State, his counting stats weren't as good. As he develops, I think he becomes a more efficient version of that guy from college, but because of the difference in roles his stats didn't translate well last year.