Bitcoins, litecoin, ethereums, doges, dollars, euros mostly. Depends on what`s interesting for me, I play dices with many altcoins just for fun, for poker I use bitcoins and dollars mostly, I don`t know any poker that accepts other altcoins, I don`t count new coinpoker here they accept ethereum from recently.
Its nice to try everything, why not. Gambling is fun and gambling with different altcoins can be fun if you like to play dices. Fact is that now many casinos accepts many altcoins, before that wasn`t like that, crypto gambling is growing, and it`s not matter what you use its important that you enjoy in gambling.
If you talking about online gambling then I use cryptocurrency for gambling and in regular casinos I use local currency because there is no facility of using cryptocurrency. I have just one crypto in my wallet and I use that one. This is builten, online gambling and cryptocurrency, traditional gambling and local currency. No one is usable in opposite side.