This kind of dilemma makes our heads difficult to choose.
You either want to be positive because it's beneficial or you'll hate it but will choose the negative sides because you're always losing. We can't define each situation when you ask this kind of tricky question.
This is not an option because there is no way we will choose something negative. Indeed, we cannot determine the situation every time we gamble but if you only gamble when in a good mood and also only gamble with money that can be eliminated, then at least you will gamble with the positive side even though the results are not always good, but with these efforts at least it will makes you have control and will be aware of the time to stop when negative results are obtained.
Yes, you have the means of not choosing it but it could be the result whether you like or not. Gambling when your mood is good, I think that's considerably a good idea if you like to think about the positive side. But as we always know, this is gambling.
Results do vary so we win sometimes or lose most frequently.