I've stayed at The Sheraton, the W, and the Aloft at the Domain
I liked the Aloft, but it's not close to anything - 20 minute drive to downtown. Great plat recognition - personalized note and amenity delivered to room.
The W is better location than the Sheraton, but the Sheraton isn't that far. The W is nice, but I did not receive anything other than my amenity (points) for being platinum. I found some of the hotel's rules (for the pool and such) to be annoying and the staff members weren't exactly friendly about it. That said, the party is definitely at the W.
The Sheraton was just a standard Sheraton. No upgrade to write home about, the lounge was functional. Walkable to everywhere downtown.