These special rules reduce the house edge on even-money bets. You may have already guessed that this makes European wheels better for the gambler! Let's run the numbers to see exactly how different the house edges are: Therefore, the more zeros, the higher the house edge in roulette. The addition of zeros to the wheel gives the house its edge by reducing the likelihood that certain inside bets will win and causing outside bets to lose entirely when a zero is selected. Before we can say which version of the game is better, we need to look at the main difference between the wheels - the number of zero pockets. Both offer the same payouts for the bets they have in common. Most of the rules for these two variations are identical. 'En prison' and 'la partage' further reduce the house edge on even-money bets to 1.35%. Special Rules: This variation may allow French rules that involve the zero pocket and even-money bets. House Edge:With only one zero pocket, the house edge is reduced to 2.70%. Pockets:It has 37 pockets with a single 0.