The currency you choose to play with has no bearing on your chances of winning; the answer is the casino you are playing with, and the question is, is the casino you are playing with provably fair in their games? If they are and support both fiat and crypto, your chances of winning remain the same, it doesn't change anything in terms of your winning margin, but where I see the advantage of crypto over fiat is the withdrawal aspect, you don't have to deal with any local bank to have your winnings to your pocket but crypto helps you solve this and not only that, you can keep your privacy protected if they don't request KYC.