I guess OP says it's about the game he can play, if that's so trends are slot games which of course has different game providers, dice, crash game which you hold until when the sky rockets crash, also blackjack, but recently people active in playing sports games so they have sports and e-sports books which you can predict the match winner, the map winner even the first score or first kills if you are playing dota or csgo.

If you are referring to the casino, I recommend the Blackjack.fun, CoinRoyale and BC.game.