As the roulette game is considered to be one of the most popular casino games there are several variations of it:
This type of the Roulette game is one of the most widely-spread Roulette game variations. This type of Roulette has a bigger house advantage because of the availability of two zero slots ("zero" and "double zero"). American Roulette's typical house advantage is 5.26%.
This type of the Roulette game is almost identical to its American counterpart. The difference between these two Roulettes is that European has only one "zero" slot. And correspondingly it has a lower house advantage which is 2.63% in European Roulette. For this reason it can be rather difficult to find this type of the Roulette game online.
This type of the Roulette game is considered to be the "original" one. In fact, the word "roulette" is translated as "little wheel" from French. Unfortunately, its origins don't mean the popularity. The point is that many online casinos don't offer this game because of the low house advantage. French Roulette is similar to its European counterpart (it has no "00" pocket). The odds are the same.
The rule, called La Partage operates the game. This rule says that one will lose only 50% of the even-money bets if the Roulette wheel stops on "zero". French Roulette is popular among avid gamblers, but not among online casinos because of the low house edge. The tables of the French Roulette can be different in some cases, but generally, they are similar to American and European Roulette.
Roulette Royal is a rare variation of the Roulette game. Generally, it is similar to European, but the difference consists in the availability of a progressive jackpot (like in Slots game). Progressive jackpot can be hit when one number is hit five times. So, the sum can be pretty large.
So, these are the main types of the Roulette game. It's up to you to decide what Roulette to play. All of them are interesting and exciting.