The Martingale method can be used effectively in Live Roulette, as you can see the results without actually betting, and then use the Martingale method.
For example, after 7 Reds without placing a single bet, you can start betting on Blacks, doubling your bet each time you lose. Of course, this is not a foolproof method, but when playing it in a Live Casino, your chances are much better.
Be careful, the ball can land on Red 10 times in a row and even more.
French Roulette is not the same is European Roulette. The main advantage in French Roulette is La Partage, which allows for the return of half of your losing bet, if the winning number is 0. The rule apply on Red/Black, Low/High and Odd/Even bets. For example, if you place a $100 bet on RED and the winning number is 0, then you lose your bet and get a return of half your bet, which in this case is $50.