Is almost certainly the wrong question to be asking. The kelly explains why: https://en.wikipedia.org/wiki/Kelly_criterion . If that's not making sense, I'd strongly suggest not investing in a casino. But the short of it, is even if it's a good investment you should only be putting a tiny fraction of your money in (to achieve +expected growth), so it's rather irrelevant which is better. The relevant question is along the lines of is X worth putting money in, and if so, the % of your total bankroll should be so small it will have almost no bearing on your ability to invest in other things worth investing in