I've tried both casino sites and esports betting platforms. They're similar in some ways but esports betting focuses more on competitive gaming events rather than casino games. Recently found https://cyber-sport.io/shuffle-promo-code which has been decent for CS:GO and Dota 2 betting. Their welcome bonus was pretty good compared to other sites I've used. What I like is they cover more niche tournaments that bigger betting sites ignore. Interface is clean and works well on mobile. Withdrawals are processed faster than most gambling sites I've tried. If you're into esports, it's worth checking their promo codes for new users - usually gives you a nice bonus on first deposit