Last year, I would have easily said Camarads. Can't say much about RLC since they banned me about 3 years ago. I'm subbed to VH now, but orgies and swingers aren't my thing, still pretty good. Just taking a break from Camarads until they can get a good new batch of couples, but they seem to be on the ropes currently.
Voyeurism has many different aspects and expectations as seen in this thread. People like different things and enjoy different fetishes. For me, Camarads has been the most successful in pleasing my personal fetish. Maybe it's because my favorite girls where from different cultures than most of the Russian girls and behaved different. Or perhaps, their cam experience allowed them to be more comfortable living on a voyeur site. I'll admit though I didn't watch the girls who did cam shows at their apartment, which was half of them.