The best one is whichever one priceline assigns you for 20% of sticker price. I've had stays at 50-70 bucks a few times.

Pluses:

Hyatt: a bit nicer in my experience. A view of the airport, usually, as the harbor view rooms are considered premium. I think it's walkable to the boat dock for the harbor taxi into the city.

Hilton: walkable to the airport and garages.