Saying he is so much better than Vidic is actually very funny. VVD is a very good defender (no doubt), but he doesn't have any competition in the PL (that's a fact) because during the days of Vidic there were serious competitions in the PL with Ferdinand, John Terry (labeled the best PL defender). So saying VVD is so much better is actually an shallow way of thinking cause he has no competition.
He is fortunate to play when there isn't any competition. If he played during Vidic's, Ferdinand, JT, Puyol and Co he won't be rated.