You do it the same way you decide between everything else, you ask a question, collect the data, and then make your decision.

'Should I win the game? every time I don't win I feel bad, but when I win I feel good. I choose to win the game. My objective is just to win the game.'

Ah, but your monologue shows that your goal of winning the game is actually evaluated relatively to another goal, of feeling good. How did you empirically get to that goal?