There are three roulette variants: American roulette, European roulette and French roulette.
It is also worth mentioning that some players are happy to eschew a high RTP in a bid to trigger the progressive jackpot on some high-paying slots. The average RTP of a slot is around 95% to 96%, so look for games with higher RTP rates, such as Blood Suckers (98%), Starmania (97.87%), White Rabbit (97.72%) and Guns N’ Roses (96.98%). The RTP rates of online slots will vary considerably at the best online casinos that payout USA.