If it's quidditch on the ground, I don't know. The vampires would make good seekers, due to their exceptional vision and speed. They'd be better at keeping up with the snitch and dodging bludgers, and hitting bludgers.
Well put into consideration that only wizards can fly broomsticks but if some reason vampires could to I guess I'd be team (sparkly) vampires. I think Edward would a very good seeker (because he's the fastest). Emmett and Jasper would be good beaters. Alice and Rose would be good keepers and then Carlisle and Esme could be chasers.
Gryffindor would win of course as Vampires can't do magic and therefore can't fly brooms. All the Gryffindors have to do is keep the game happening high enough. The best the Cullens could do would be to wait for the bludgers to come to them and then use their super strength to bat it as hard as they can and take out a Gryffindor one at the time until no players are left. They'd then have to wait for the snitch to come down close enough to the ground so they can jump and catch it and end the game.
If the vampires were دیا the ability to fly, then they'd win easily and quickly. Quidditch is a sports and so the most important aspect of it (apart from the flying) is its players physical attributes and physically the Cullens would wipe the floor with any wizard. Magic is only used to make the equipment work ie the brooms and the self propelling snitch and bludgers. With the vampires' naturally heightened senses of vision and hearing they'd spot the snitch way before any wizard would. The same would happen with the bludgers. They'd be able to avoid them easily and then use their strength to hit the bludger towards a Gryffindor and knock them out. Being hit سے طرف کی a bludger would also not bother any of the Cullens as they'd hardly feel it. The Cullens wouldn't need to be near the the hoops to score points with the Quaffle. As physical contact is also permissible in Quidditch, and substitution is not allowed, the Cullens could easily kick a player of their جھاڑو until none were left except maybe the keeper.