Its a pretty pointless question to ask/answer to be honest. They play a different system to us, and as such have bought/recruited players to use that system. Nani and Valencia would not make our team because we dont play with wingers, hence the comparison is pointless. Yaya Toure, Barry De Jong and the like play in our team because Mancini likes to pack the midfield and try dictate play, the Rags play a purely counter attacking style and as such they can afford to have absolute tosh players like Carrick and Fletcher in the middle.
For what its worth I think our first 11 shits all over theres when playing to the respective sides potential. United have a very effective system that has done well for them, however this does not mean that the players individual qaulity is higher. Yaya Toure is a world class CM and would make their starting 11 without a shadow of a doubt. At the end of the day it all comes down to a teams system and what players are needed for it to work. Lionel Messi for instance may be the best player in the world, but would he necessarily make a Stokes side? Considering how they play? A pointless topic imo...