Two roulette tables can look identical: the same layout, the same bets, the same payouts. Look at the wheel, though, and one of them has an extra green pocket. That single pocket nearly doubles what the game costs you.
One zero or two
A European wheel has 37 pockets: 1–36 and a single zero. An American wheel has 38: 1–36, a zero and a double zero. The payouts are exactly the same on both — a single number still pays 35 to 1 — so the extra pocket is pure profit for the house.
What it does to a system
Because a system only changes how you bet, not the odds, the wheel affects every system on the site. We simulate both wheels wherever we can, and the difference shows up immediately.
Take Fibonacci Dozens with a $1,000 bankroll and a +$50 goal. On a European wheel, 93.2% of our 10,000 players reached the goal and 6.8% busted. On an American wheel, the win rate fell to 92.1% and the bust risk rose to 7.9% — and the average loss per session doubled, from −$10.92 to −$22.11. Same system, same bankroll, one extra pocket.
Use the European / American switch on any system card or system page to see the difference for yourself.
The worst bet on the table
American tables have one bet you won't find on a European wheel: the five-number bet on 0, 00, 1, 2 and 3. It pays 6 to 1 and carries a house edge of 7.89% — the worst on the table. Skip it.
Even better: French rules
Some tables use French roulette with the La Partage or En Prison rule: when the ball lands on zero, you get half of an even-money bet back (or it stays for the next spin). That cuts the house edge on red/black, odd/even and high/low to 1.35%. If your system bets on even-money chances and you can find these rules, use them.
How to choose
Online, European roulette is almost always available — look for "European" or "French" in the game name, or a wheel with a single zero. In a land-based casino, check the wheel before you sit down. Only play American roulette if there is truly no alternative, and expect to lose faster when you do.
Next: the three stop rules every session needs — decided before the first spin.