I have met a lot of people who like to gamble and that's cool but a majority of them say they "know the secret" they can "beat the system" it's wild for so many people to think they can edge out the house or there is a system that hasn't been figured out and blocked yet.
Honestly if you're looking for odd's martingale roulette could be it and just always bet on one color but make sure you have a hell of a large bankroll to rock it.
It is impossible to win with that strategy as well, casinos know of martingale and as such they put table limits, so at some point you are going to lose more money than what you can bet in a single spin of the roulette, also I do not understand why martingale is so attractive to people since you end up betting huge amounts of money just to recover your initial bet, I know that it gives the illusion that you cannot lose, but it is just that an illusion, and when you finally lose you lose all your capital.