You are serious?
These two do not even remotely play the same type of game. Azu is a penetrator, and looks to have great ability to get into the paint and get shots off where he has no business being. Great rebounding guard, with the size to matchup at small forward. Good wingspan and defender, has ability to get up and bother shots. More athletic.
Mason looks more like what the spurs drafted George Hill for.. a smaller combo guard that likes to spot up from 3pt range or just inside the arc. He's gonna be the new Michael Finley, 1 dimensional player that when hot, will help spread the floor for Duncan... and if he's not, well .... the spurs are going to struggle.