I believe that Stake and Primedice is owned by one person so I guess they are both legit and trusted in same way,and cloudbet has been here for longer time also and I remember that I tried their site once.but those two wasnt in my idea as Ive heard just now
And maybe if you will update the OP to put some sites here that is being popular and trusted by many gamblers here in crypto like
Yolodice
Windice
777coin
Bitvest
Cryptogames.net
And many more to mention
And we could add more site to the list, almost all casinos have provably fair verify tools for the users, is one basic thing casinos need to have nowadays. But even with those tools the casinos could be rigged, and i say this because not all of them shows the seed before the bet, they show it if you click a button, but while this seed is hiden they could manipulate their bets.