I have stayed at all three properties and would recommend Sayan first and foremost...the service as well as the breathtaking atmosphere is top notch. As far as the 4 Seasons vs. The ritz, the villas are closer together at the 4 seasons but are actually more private...if that makes sense. The view is not as good at the 4 seasons, and the service is excellent at both. Don't grind your teeth too badly over where to stay, the service and experience will be phenomenal. Make a decision and don't look back, you won't regret it!
P.S. make sure to visit Ulatwatul (sp?), it is absolutely amazing!