I'd rate the luxury Marriott group resorts I've stayed at in SE Asia as follows:
- RC Mandapa
- RC Phulay Bay
- St R Bali
- W Koh Samui
- RC Langkawi
- LC Naka Island
- LC Vana Belle
- W Bali
- St R Langkawi
- RC Koh Samui
- RC Bali
That ranking is not purely based on the hard product, but also on the service, location, beach etc.