I think all cryptocurrency gambling sites works the same. The only thing they differ is their transaction fees, Bitcoin and Eth is the big two for that. For how to predict the next roll, I'm afraid that's based on how lucky you are in gambling. There's no way someone could predict random numbers accurately, there's only thing called "luck" for that.

Using Bitcoin in gambling is very expensive in my opinion since you could lose to much profit in the long run. For example if you use 0.1 BTC in gambling that's worth $5,600 could be $8,000 after a year or so if you just hodl it.