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Not many gambling sites accept XRP, so I think we need to search for another gambling site. We can still use the other altcoins besides XRP, which have a fast confirming transaction.
That's totally correct and I think LTC and TRX are much better options compared to XRP because XRP is stuck in a lawsuit and can go down any day, so even if the gambler makes a big bet and wins but the price gets down, he will suffer due to that. Even Doge can't be trusted in terms of gambling with it because it has also become a puppet of Elon Musk and can get dumped any day so it's better to stay away from these 'shitcoins' and only gamble with what's going to stay here for longer.
Maybe in terms of transaction cost TRX is good. For the same we can't say dogecoin and XRP all gets dumped. Going through the growth chart we can find the growth of these coins are high compared to more cryptocurrencies that are into hot discussion.
In recent days dogecoin got manipulated, even before that with its nominal growth it was within the top 100. XRP on the other hand has undergone lawsuits, but the real-time usage keeps counting. So, these are temporary issues and growth with XRP and dogecoin is sure in the long term.