van Persie has better/more refined technique, I'll give him that. He'll score flashier goals and pluck the ball out of the air more beautifully as a result. But he slows things down, doesn't move, doesn't play well with any partner, doesn't defend from the front as well. And with Rooney in no.9 he'll score a similar number.
Falcao's a better finisher. I'd possibly agree with this. He's so good at what he does, even if it's not as much as Rooney does.
Mata's quite similar to Rooney, in my opinion. But obviously he has better touch/control. Barely anything in that one. Mata has weaknesses, as does Rooney.