Roulette has no strategy. Every bet — red/black, single number, dozen, — pays out at the same . So the only real decision is which wheel you play.
European (single zero) — 2.70% edge
37 pockets: 0, 1–36. Every bet pays slightly less than fair . A straight-up number pays 35:1 when the true are 36:1.
American (double zero) — 5.26% edge
38 pockets: 0, 00, 1–36. That extra 00 nearly DOUBLES the . Same payouts, more losing pockets.
The sharp move: refuse to play American roulette. Find a casino with European wheels. In an hour of $25 bets at 40 spins per hour, the difference is $26 per hour in extra losses on American — for no benefit.
The ONE exception where American is uniquely bad: the "basket" bet (0, 00, 1, 2, 3) has a 7.89% edge — the worst roulette bet in the house. Avoid it.