I would use this strategy

A has lower return but low risk. B has higher return but higher risk.
I would do B when I have more money, but when I am not rich, I would do A.

So, the first time, I do B. If win, continue to do B. If lose, I only have $8 left, so I do A.

My strategy should allow me to play times the better, because the return is positive each time.