As good as he is I could see personality clashes between him and Pogba, they wouldn't both be able to be the star man at United which could create a very uncomfortable atmosphere.
Pogba has so much problems with his attitude in a star-studded France team, right? More so, they seem to have a similar lifestyle and interests off the pitch, I would think that they'll love playing with each other.
There's nothing to this rumour, obviously — we're a downgrade from PSG if we're talking about the player quality and probably as a place to live, so I doubt that he'll be considering United but that argument is just weird.
Neymar would've been a dream, despite him being an annoying prick on and off the field. He's one of the very, very few players who, I believe, will perform at the highest level despite the circumstances like different tactics, managers, leagues etc.