Look at it logically.
He won't got to city as they would need to offload players first.
He might join Juventus, but would only be for the money as the italian football isn't great
I can't see him staying at arsenal, unless he is happy with the signings, but even then they bought 2 x strikers have they not?
At united, he is guarenteed a game, gurareteed trophies, and not alot of people get the chance to play for united.
Just my 2 cents