That's a fan's view.
I think Manchester United's the best club (it's why I'm here) and it'll be a very very long time before Chelsea matches our history.
HOWEVER, most player are not fans of their clubs before they join (they might become "fans" while playing).
I expect even less care about the past players that played for their new club.
Being a Manchester United player is far more prestigious than a Newscastle player (unless if you're Shearer), an Everton player (unless if you're Fellaini), a West Brom player, a Norwich player.
But not many will view being a Manchester United player more prestigious than a Chelsea player.
We are equal.
We are both in the top tier of the game.
This season, not having CL won't help.
So then players will look at the money, the manager, chances of winning trophies, the location
Money we might be competitive (depends how much Roman wants the player!)
Manager we might be competitive (unknown yet)
Chances of winning a trophy is currently tilting in Chelsea's favour.
Location we're most likely not competitive.
Since Roman, we have not won many (if any) transfer battles against Chelsea.