De Gea is right now the best goalkeeper in the world, but he has made a couple of mistakes too especially in last season. No goalkeeper is immune from the occasional mistake though. VDS was a positional keeper, that is why he didn't need to make Hollywood saves every now and then. He made everything look easy with his position. De Gea is more of a good shot stopper, but hey, he has his weaknesses too sometimes like I noticed some of the times his goal kicks are just flat, and it ends up going to the opposition and they attack us. I find it ridiculous that VDS is any less than De Gea. Both are equally good, and I would find it difficult to choose between the either. VDS was very calm and composed, even at a later age when the reflexes start getting slow and you make mistakes. I can hardly count any mistakes VDS did, and I feel like the fact that he made every save look so easy makes some of us fans think he was not as good as De Gea is. I feel like sometimes we fans forget how good VDS really was for us, because he didn't need to make Hollywood saves every week.
I definitely don't buy into the Rio/Vidic logic, yes we had a better defense but that's a dumb argument. VDS was a real leader, and he was very calm and composed. He kept teams out when we were playing away in hostile places like AC Milan, Barcelona, Bayern etc. Give the chance if we face better teams in Europe, De Gea will do the same too. I completely believe he is the best goalkeeper in the world now.