De Gea is probably a better shotstopper, than Schmeichel was, but i would argue, that it's the one area, he surpasses him, and it aint by much imo.
Schmeichels presence and commanding in the area was invaluable. And the way he distributed the ball, no one did better than him.
I read sometimes, that some of you think, that you lack leaders and winners in your team. Schmeichel is up there with Keane in that area imo. He never tolerated spineless performances, and he would call anyone out, if they weren't up to it.
De Gea is one if the best keepers in the world, and has been for some years now. You're lucky to have him!
But in my opinion, Schmeichel is one of the best keepers ever. He had no weaknesses imo.