Do you gamble with fiat money or crypto ?
I do gamble using both fiat and crypto. Lately, I use crypto more though because it is easier to bet online. Using crypto in gambling online has lots of benefits like anonymity and ease of use.
Which is better and have more chances of winning ?
In my opinion, it does not affect your chance of winning. It is how you gamble or make your bets that matter. If you are recklessly gambling, then you lessen you chance to win whether it is fiat or crypto that you use.