I've tried both fiat and crypto. When betting on https://1xbetpak.com/ , I used cryptocurrency a couple of times when I wanted to withdraw money faster. Yes, the exchange rate fluctuated a bit, but if you withdraw in a stablecoin, there's no problem. Fiat is more convenient when I make regular small bets. For example, I bet 500 KES on the total in a match and then withdrew the same amount back to my mobile wallet. Cryptocurrency, on the other hand, is convenient if the amount is larger.