Some online casinos offer better Blackjack odds by providing favorable game rules, such as allowing players to double down on any two cards or offering a 3:2 payout for Blackjack instead of the less favorable 6:5. Games with fewer decks generally have slightly better odds, and live dealer Blackjack often mirrors land-based casino rules. The house edge can vary based on the specific rules, but casinos that use standard rules and avoid restrictive terms tend to provide better odds. Always check the rules and RTP before playing to ensure you're getting the best terms.