Oscar is a better midfielder, but not as good at #10 as Mata. When O is playing at #10 you realize the other 3 guys upfront generally have bad games. Mata has better positioning than O and Mata drops back just as much as if you pay attention. Oscar is better defensively and faster, which is better for a counter attack. If Oscar were better for our midfield we would control games alot better when he plays in the #10