I prefer money, strongly. When you gamble with money, you are *risking* money for a chance to win money. It is always a losing proposition. But it’s not the same as *spending* the money. If I walk into a casino with a $50 bankroll, and I walk out of the casino an hour later with $40, then I’ve had a good night. Cause losing the the money will be okay for you but on the process that you won as will you'll enjoyed more than coins, you won't have to trade anything at the moment.
But gambling with coins will involves of spending more money on the play coins. Which have no value or gain at the moment (if they have value, they wouldn't be play coins, they do just be different kind of currency) So, you’re paying for the privilege of risking something of no value in the hopes of winning something of no value. That doesn’t even count as gambling anymore; that’s paying a fee for the privilege of keeping score on a random number generator. What's your own opinion towards this?
Either your title is misleading or you are confused about cryptocurrencies and online gambling because you can't say that coins, which are probably cryptocurrencies you are referring to, have no value because they do, some of them even have more value than most fiat currencies because if 1 BTC is equal to $63k or more, it means it has value and it has a lot of it. So just like many others in this thread, I don't understand what you are trying to say here.
If you ask about preferences, you should be comparing online fiat currency casinos with online cryptocurrency casinos and out of them, I would surely go with cryptocurrency gambling because it is way more convenient and easy because transaction speeds are much higher and you can get your deposits and withdrawals way quicker when compared to traditional online casinos.