So for many years, I've used a comparison to roulette, where you don't know when any given number will turn up, but the odds of the game will. Probability slots vs. Roulette have always been major rivals when it comes to which game has higher odds. Although both games have reasonably low odds, it is. The Roulette Wheel has the next best odds. If you stick to betting on just reds or blacks, you once again have and those ever popular slot machines, have the lowest odds of winning, with a house edge of 10 percent or more.