This is incorrect. There are better and worse strategies.
How can there is any better strategy except doing martingale? But you really need a lot of balance for sure to recover your bet. And I think worse strategy is just because you are no luck
Maybe you didn't understand what I said.
I am saying that some strategies are better than others for doubling your bankroll. Astargath was saying they are all the same, and all have 49.5% chance of success. He's wrong.
To provide an example, imagine trying to bet at a 1% win chance, and doubling your base bet on every loss. That's sounds pretty crazy. Worth it? Maybe if you're lucky and have the balance to support it. Is it riskier than normal martingale with an appropraite base bet? Certainly.
Just remember it all boils down to your luck. The same person who would have lost on the normal martingale could have won on a much riskier strategy.