Currently, the TRC-20 network is also not available on Bet105.ag; they are only available for the ER20 network.
Only a few coins can be deposited into this casino, so perhaps a suggestion for the future would be to add Solana or a cheaper network.
Indeed, the BSC network has very low fees, plus withdrawals from Binance are free, making it easier for gamblers to make deposits to the casino.
If they have plans to support more coins (which I suppose they do), then I suggest starting with TRC-20 tokens. BSC is also a good option, but it's not just about which network has the lower fees, it's more about which network is the most used. Tether on the TRON network is, as far as I know, is the most used stablecoin. So, I guess it’s the first coin they should consider adding..
again, this is just my opinion.