I'd take him over Maddison and Mount etc., but as we have seen in the past, being top class for Villa rarely translates for being top class elsewhere. Ashley Young, Benteke, Milner, Barry, all had to settle for a lesser role at their new clubs at one stage or another.I think Grealish is a talented player , is he any better than say Ward Prowse or Maddison or many others in the prem . Not sure yet , would he look better in a better team ? Probably , would he get into the Man U first team , not sure yet, think he'd be on the bench
He might go on to be as good as Dwight Yorke for Utd or he might go on to fail miserably like Benteke. But right now, I wouldn't trade him for any player in his position in the world because he has that bit of Villa passion and understanding that other players wouldn't.