If you compare between these 2 properties, go for Rayavadee. It's far much better property. Sala is a local run, no service standard can be matched to Rayavadee which equal to the SLH. Sila Evason Hideaway, Buriraya and Tong Sai Bay in Samui should be a more appropriate match to compare with Rayavadee. Tong Sai Bay is a member of SLH hotels. Buriraya runned by Marriott people in the process to be Renaissance Koh Samui. Sila Evason Hideaway has a very beautiful swimming pool. The only concern about Evason is the privacy of the room which is the most important issue for the newly wed.

The choice is yours !!!

Good Luck