While none of them is spectacular, the Marriott is the newest and, I believe, the hardest to redeem awards on.
Rooms at the Prince de Galles vary widely in size and upkeep.
Location-wise, the Marriott and Prince de Galles are more centrally located than the Hilton (near the Tour Eiffel), even though the upper Champs-Elysées area is rather too crowded IMHO.