With online casinos gaining steady ground on land based casinos, many of the traditional gamblers are moving more and more towards the cyberspace side of things.
With this tremendous shift from land based casinos to their online counterpart, it's becoming quite inevitable that the 2 versions of roulette should be compared.

First of all, accessibility plays a big role here. The fact that you can play a variety roulette games in a matter of seconds is a big deal. Not only are the games easily accessed, but there is usually a bigger variety of games available.

Second, there's the game pace. When you're sitting at a land based casino, you have to either endure  a slow player that takes forever to make a move, or you're a slow player yourself and your getting an evil look from the other players at the table. All of this is nonexistent with online roulette and you're free to play at your pace.

Third, you can practice for free. There is the option of opening up free accounts with online casinos that are charged with virtual money. This allows you to practice for free on the same platform you'd be using with real money. This makes for a huge advantage that was never available before.

Overall, online roulette has some big advantages over it's land based brethren. The ease of access, pace control and practice options are what makes it a better choice.