Dominique was father of the 360, the windmill, and explosive dunking.
Vince Carter, Levine and Gordon can combine the 360 and the windmill in one dunk, which even Nique never did.
Jordan did the FT dunk better than Dr. J - MJ does it off the dribble while JE travels, which doesn't look too good. But Levine can do the FT dunk with a windmill or a between the legs (short of the FT line on that last one), both of which are harder than the mere tomahawks that Jordan and Erving did.
But Julius Erving was the most graceful dunker ever. I agree that in-game cradle dunk over Cooper is the most beautiful dunk ever.