I use martingale strategy it is easy but high risk.. need big bankroll

I don't know what is the best strategy..
You need a big bankroll for martingale but you also need big limits in whatever game you are playing in your favorite casino, but I think martingale sucks as a strategy because you only need a few losses in a row to never see your money again.
Regardless how much bankroll you have, I do not recommend martingale system. It will eat your entire bankroll when you have a cold streak. It's not advisable for a gambler who loves to play and last in the game. Just be conservative and use flat betting.