Actually there is a huge difference between sites.
This info is very valuable so I'll ask that it not leave this thread.
Stars - Chase straights. Any straight. Gut-shot, open-ender, double belly-buster, doesn't matter you'll get there on Stars
FTP - It's all about the flushes on FTP. It been proven statistically that people who play any 2 suited cards on FTP have the highest win rates. The site is especially known for it's propensity for runner-runner backdoor flushes, so don't give up on the flop.
UB/AP - The Cereus Network favors neither flushes nor straights but gives both out in equally high numbers and they are especially fond of "set-up" hands where one person has a set and the other hits his flush or straight on the river. It's always on the damn river. So if you're on UB with a set and the most weird backdoor draw gets there if your opponent bets fold, even to a min bet because no matter how good the price is you can't beat the UB river.
Those are the only sites I play (free rolls mostly) so I don't know about the rest. I do have a friend who plays on iPoker and he says they love the set. He swears that he will raise 22 all the way because he knows he'll have a set by the river. But I don't know how big his sample is so you might want to test that one first.
Well armed with this new information you should be good to go. I'd wish you luck but with the above, you won't need it.
PM me if you want my Stars screen name to send a little cash my way.