And he won't get the time on the ball that he gets in Italy. Imagine him with Lee Cattermole or Charlie Adam snapping at his heels.
He'll get more time and space on the ball here.
Regardless of anything else to do with Pogba, or quality of each league, everyone who's watched a decent chunk of Italian football knows there's much less space, and the midfields are much more congested.
Tevez commented on it when he went to Italy. He said that there was no midfield in England, the ball just pinged from defence to attack much faster. In Italy teams clog up the midfield and it slows the game down - but it also means that there's a lot less time and space for midfielders to play in compared to the much more open Premier League.