On the surface Gay's numbers look slightly better, but he plays about 4 more mpg, shoots more, gets to the line less, and shoots shoots worse from 3.
PER 36 the scoring is even, except Gallo is doing in on 2.1 fewer shot attempts. And Gallo wins the rebounds, assists, FT, 3pt shooting, and significantly fewer TO's for Gallo.
And Gallo blows away Gay is TS% and EFG% because of the fact that he gets to the line more and more of his shots are 3's. So Gay might be shooting SLIGHTLY better from the field, but its because he doesn't shoot as many 3's as Gallo.
http://www.basketball-reference.com/...ayru01&y2=2013
Basically Gallo has been FAR more efficient, don't let the 40% FG fool you, he's always been a very efficient all around scorer.
Gay is very overrated IMO, he's sort of like Felton in the sense that he will get his points, but he's going to take alot of shots to do so because he won't hit many 3's or get to the line very often.