don't get the obsession about West Ham here, yes they have signed some seemingly big names on paper but dont they sign some marquee players every other year and still fail? Some of y'all are only raving about them because they are basically barking like dogs in the market and nothing more. Having said that, Pellegrini is no pushover either, even when you discount his tenure at City and Madrid, his history with mid-table clubs suggest that he has the ability to bring the best out of them. Look up his time at Villareal or Malaga. Whether he can do it with a bunch of mercenaries at West Ham is a complex question which can only be answered once the season starts. Personally I think it is very unlikely given their opening fixture list.
I believe Silva is a modern up and coming coach who will have more motivation right now prove and he like Pellegrini he has shown that he can bring the best out of an average squad too, a couple of signings and boom we should be up there consolidating 7th place at the very least. When it comes Silva vs Pellegrini, the only factor that comes to my mind is that Silva will be more motivated to prove something that Pellegrini.