Well, Primedice is the best site I have ever know, if you play there, so many wins can you get even more in almost every month Primedice hold a contest that could make members get many bitcoin, but if you do not want to try Primedice, maybe you should look for better than that, and you might try playing in SatoshiGames.io
I do agree that primedice is one of the best sites for dice game, but I don't agree that you can win only on that site. Because dice game entirely depends on only luck so winning should be same in all those trusted sites. You can also try fourtunejack dice game and it has got a good layout for dice game and bets are quite faster compared to primedice.