Slots are the easiest games to win at, hands down. That's because they require no skill to play the outcomes are completely random. If you're looking to enjoy relatively frequent wins, low-variance slots are the way to go. These games have a high hit rate, although their payouts are correspondingly lower.
The online casino with the best payouts in the US is BetMGM. This site has an extensive library of 800+ casino games and an overall average RTP of 98.3%.
Since they're licensed and prominently display a seal from state gambling regulators to prove it, BetMGM, Caesars Palace, DraftKings, Golden Nugget and Borgata are among the most trusted online casinos.