No matter which system you use, the house edge stays the same. However with martingale you either win big or lose bigger.
Not true - you do not win big with the Martingale system, do the math. As you keep doubling down you are only ahead by the amount of your original bet. So when you finally win, you only win the amount of the first bet. When you lose, you can lose your entire bankroll. Since people can't seem to understand this on this thread, here is an example following the Martingale system (doubling your bet after every loss):
Bet 1: 5
Result: Lose
Loss/profit so far: -5
Bet 2: 10
Result: Lose
Loss/profit so far: -15
Bet 3: 20
Result: Lose
Loss/profit so far: -35
Bet 4: 40
Result: Lose
Loss/profit so far: -75
Bet 5: 80
Result: Lose
Loss/profit so far: -155
Bet 6: 160
Result:
WinLoss/profit so far: 5
So you can see that you end up putting down bets as high as 160 (and risking over 300) just to earn 5 in the end. And if the bet maximum would have been 100 for example, this person would have been screwed, just to try and earn 5.
Martingale is a crap system. End this thread.