Watercolours is the construction next to the Beachsuites and is well underway I don't when the actual outside completion date is. Beachwise the Westin has the heads up, but the BS offers a small kitchen area where you could do breakfast, lunch, snacks. We stayed while our place was being painted and we had a cheapo room but it still had a bedroom, living room, kitchenette area and a balcony. Never stayed at the Westin, but know that the rooms are presently being renovated. The Beachsuites were formally part of the Hyatt and when they were built they took up beach space. The Westiin has a bigger beach. As Kiddos mentioned the Westin has more available beach space. SMB is actually 5 1/2 miles long so they are very close. It is a toss up about what best suits you. I think they are both great for different reasons and I think you will be delighted with both locations. How many are you? Any more than three and I would look at centrally located condos, but otherwise either will be a pleasure.