The majority choice is bitcoin and I never doubt that this coin will become common use since bitcoin is very popular than the other altcoins. They don't matter about the transaction fees, most bitcoin users are concerned about the personal identity to disclose or something bank account that may link to the gambling casino.
Bitcoin is the best choice because it is widely accepted by most exchanges. For the lowest fee, dogecoin or XRP is the best choice, these also have a speed of the transaction.
though there are also other popular alts used in gambling like doge or xrp, still the top currency used is btc. most known casinos here has btc as their main coin and some actually have only btc as their option for betting like futuur, which first came to my mind. but other long and established casinos have long list of coins to choose from and of course btc will be on their top list. its true, it is accepted in most crypto exchanges and you can always find a btc pair in the exchange platform.
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