To spin individual simulators of these online roulette wheels, see the links below:
As you can see when observing these two online roulette wheels placed side-by-side, it is apparent that the European roulette wheel has one green pocket (zero). This means that if the ball on the wheel lands on it, the house wins. There are 36 other pockets marked red or black.
An American roulette wheel has two green pockets, zero and double zero. Again, the house wins if the ball lands in either of these. Similarly, there are 36 other pockets marked in black or red.
The European roulette is better for players. This is because the likelihood of the ball landing on a house pocket (green) is half as likely. Additionally, the returns given for players in both games for landing on a pocket are exactly the same.
In short, given the choice between European and American roulette, it would be foolish to play the American version.
Use either or both of these online roulette wheel simulators to suit your specific needs.