I was a platinum member at the Westin, but not when I was at the Ritz (Gold then).

I’ll say the service at the Ritz was bar none some of the best I’ve had.

The beach was nice at both, the Ritz has more water activities included (whereas they cost more at the Westin). The Ritz also had these cool floats in their beach area that were anchored down and you could just go out there and float for hours. The pools were about the same size, the Ritz’s had a real deep end whereas the Westin was relatively shallow for most of it. The Westin has a swim up bar though, but the drinks are a lot better at the Ritz (best Pina Colada on the island).