In French Roulette, players often utilize the "La Partage" and "En Prison" rules, which reduce the house edge on even-money bets, making strategies like Martingale or D'Alembert more effective. The house edge is lower (1.35% on even bets), encouraging players to focus on outside bets such as red/black or odd/even.In American Roulette, the house edge is higher due to the double zero (5.26%), so players often focus on risk management. Strategies like the Martingale can be riskier, so players may opt for more conservative approaches, such as flat betting, to preserve their bankroll over time.