Primedice.com, yeah
I'd vote PD except I always lose on their site!
Losing and winning is all depends on individuals luck and nothing to do with a site as long as there are probably fair sites. Primedice is the best site for dice game, but they should also consider adding few other games as well to their site. But it looks like they are getting enough traffic and profit with only one game, so they are not considering to include other types games.
If they would saw that they are profiting on a one type of game they will surely focus on that one and would not plan to add more games and i agree on what you have said.My vote goes to Fortunejack itself ive been playing there and i admit i do play on primedice too.