I'm not a fan of either property, but... choose the Sheraton if you want to be close to Black Rock and a larger beach area. It's quieter. The hotel just doesn't have many amenities.

The Westin has a huge pool complex and Whaler's Village next door. It's very convenient if you want stuff to do. But I don't think the beach right out in front is as good due to the crowds.

Again, both properties are lacking when it comes to rooms, restaurants, service, etc. The choice here is between locations only.