Cilic is by far the superior player. He is still young and is improving. If not for his injury, he might have been a solid top 10 player for a year already. Cilic has no big weapons, but neither does Wawrinka. They both are mental clowns and pigeons of the highest order. They both make stupid UE. The thing which separates them I think is their commitment levels. Cilic does not bend over unless he chokes. Cilic tries to come back from losing positions. Cilic has a better return and even though it sounds funny, Cilic has some on court strategy which Wawrinka hasnt. Whether it works or not is another question, but there is little doubt that Cilic is the better player out of the 2.