We have been to Hedo a few times and Desire Riviera more than a dozen times. Just back from our first trip to pearl....
Pearl food and facilities are best. We stayed in the top penthouse - outstanding room (although the 47 stairs to the room were tough some nights.....) Service and staff were great. No complaints. The difference is the people and environment. Pearl is 1/3 nudist, 1/3 voyers and 1/3 (or less) lifestyle people. That is ok - we had a great time for sure. But - if you are looking for a more 'interactive' crowd, Desire Riviera is the place for you.
Massages.... We did the erotic and found it a bit overrated... It was great and fun but it was awkward for us being felt up by someone fully clothed Deep tissue massage was very nice a few days later.
We met some great people and will keep in touch. All good but summary is this: SANDALS IN THE NUDE (again - no complaints, we like being nude but the overall crowd and environment is hotter at Riviera).
Hope this helps......