I mean technically the games that give you the best chance to win big or card games. Games that take skill, that aren't manipulated by the casino (slots, for example are something we all know are manipulated). If you're good at the table games, then you've got a better chance of winning big versus playing something like a slot machine which is a complete gamble.
Usually, all the casino games are luck-based and I don't find many differences between slot games and card games in terms of luck. People do argue that you have to use your brain in the card games and they are totally different from slot games, but still, you need good cards in order to win the card games and that again comes with good luck.
In my opinion, if you need to have a bit of an edge go for the sports games and there you may have some data to analyze, otherwise it just pure luck to play with.