For EUROPEAN wheels:The ODDS of winning for a European wheel are 1 in 37 (because there are 37 pockets)
For AMERICAN wheels:The ODDS of winning for an American wheel are 1 in 38 (because there are 38 pockets)
If your roulette system is not using physics to predict the winning number, The European is a much better option than the American wheel. It’s not a matter of opinion. It’s absolute fact.
But if you are an advantage player using physics, then the house edge is merely just another variable to consider. In cases where the wheel is clearly predictable, it would make little difference if the wheel was American or European. Of course the player’s edge would be lower on an American wheel. But when you can achieve edges like 120%, the problem isn’t beating the wheel – it’s avoiding being greedy to prevent detection.