For me, the most enjoyable of the above are slots. It's far more relaxing than any other; no need to know anything, just put your bet amount and start. If you are lucky, you win; if not, then you move on. Crash never intrigues me to play, so it's out for me. As for card games, I prefer to play them with friends (when it comes to poker) or in a physical casino (when it comes to blackjack).
Well, it's a quick, easy and direct game. I'm not a huge fan if it because you can quickly lose track of how much you're spending, while it also feels quite repetitive that it becomes boring for my preference. Crash is the first contact I had with gambling games. It's a nerve-racking, interesting, but extremely annoying concept that can keep you hooked for hours. I still play from time to time, but after suffering some major losses, it's one of my last options.
As for card games, I've got zero clue, I've never played any, I was always the clueless person in the group who had no experience with any card games.