I personally really like Crypto-Games and Primedice. Crypto-games because of the investment and the high faucet and primedice for the nice community and promotions. 
Betcoin.ag is best when you are playing with the casinos easy profit when you are winning also fast replied when you need an assistance in their support or in the management no doubts at all i Like primedice too when i lose big money sometimes and get it back when luck beside me.