I belive some one is better of betting for a repeat then chasing a sleeper when it boild downs to numbers.
Or just play hot numbers, but you need to base the method on the right principals.
For example if you list the latest six numbers with no repeat and then play them for certain amount of attempts, then you might at least Catch one or two numbers hitting from a larger bias sector or numbers that peak with 4 to 5 stds.
I quote Caleb:
Some roulette facts..
Here's the real deal on past spins influencing future spins. The following information is based on a REAL ROULETTE WHEEL WITH A LIVE DEALER. On these wheels the rotor did NOT alternate spin direction- (every other spin like they do in EU).
The following information does NOT pertain to an RNG based wheel or the random game of roulette. In other words, no electronic machines.
I can tell you the facts, based on my experience, as they pertain to a real wheel. Here they are, like them or not.
1. If a number has hit within the last five spins, it really is slightly more likely to hit on the next spin.
2. Simply playing the last five numbers to have hit will slightly reduce the house edge, especially when the wheel speed is close to the speed of the previous spin. In rare cases, you can get a small edge on some wheels playing this way.
3. The dealer's pick up and release of the ball is not random, like someone on this board had stated. As a matter of fact, it will quickly spike out beyond five standard deviations in a short period of time for most dealers, if you take the time to measure it.
My own comment:
Caleb once mention about the above that the optimal attack sequense would be three attempts.
As the hit ratio peak at 678.