Personally if I was going to play Roulette now(and seriously wanting to win, not just have a good time), I would watch 1 table through about 40 spins and see the amount of red to black, and odd to even, and the numbers if possible. Then play those that hit most.
I believe a group of MIT guys(and girls) watched tables and realize they repeat more than you would think, and won Big.
Casinos would relocate the tables to make this difficult, they would mark the individual tables.
I use to think this was a VERY random game, just like KENO, but a guy with one of the slot companies who tried to warn the Gaming Commission about Fixing of slot machines, and when they did nothing, he decide to try, he figure how to win at KENO, he had a friend in a room with the program and Laptop and told him what to choose.
To this day I don't know how this worked?