Stars should have the most population, followed by Full Tilt.Their lobby systems are vastly different, however.  Stars you can only register one game at a time, whereas FTP a lot of regulars just sit in new games and wait for fish (so there can be 5-10 lobbies at one level with only one player registered).For a solid regular, I believe Stars system is superior, as it prevents weaker regulars from sitting first often times, which makes the wait for a fish less time (even if you're trading lobbies with 2-3 other players, the fish is usually sitting the first one or two guys on FTP and if there are 5-10 guys, including weaker regs, you have to wait... or accept a game vs a weaker reg with a potentially smaller edge).From there, Cereus and Merge aren't going to likely fulfill your volume alone, but they can be great sites to keep money on and sit in the lobby while also grinding on Stars or FTP.We have 35% rakeback being offered on Merge (playersonly, sportsbook, carbon I believe are skins that we offer, they are all the same network) and 33 or whatever the maximum is allowed on Cereus too.  The advantage of Merge and Cereus is that the games will be very soft, as soft as Bodog at least.I'd probably suggest going with Stars and then one of the other two smaller ones in addition (if you can spread your money around like htat).  Stars has 10 minute blind levels, and moving onto a tougher site you probably don't want to end up playing a faster structure from the start (FTP is 5 or 6 min blind levels, so their regular speed is more like Stars turbo speed).