It's better for him to join Manchester United, Bruno is currently under perform, if he can consistent and always give a big contribution to Manchester United, he will be very popular.
Seeing Manchester United plays and the news surrounding them makes me believe it's a terrible decision for any player to go there because the situation is too chaotic. There are too many conflicting rumors about their internal situation, from ETH's lack of backing to players supporting him, etc. I dunno, unless the contract term is really good maybe it will be hard to attract a great player to join them, especially when they face competition from Man City, Madrid, etc.