I'd like to keep him at Milan but I have to admit he would fit in at Arsenal perfectly.
If he can stay fit and get a decent run of games again he is a great player
Personally I'd also like him to stay with Milan as my godfather is Milanese and I've been following them since my birth basically, but if he were to go somewhere I'd hope it was Arsenal.
Yeah I still remember how he basically carried Milan in 2013/14 season while being what 19-years? Injuries haven't been easy for him, but for that I thing there is more of a problem in Milan medical department than with the player.