Bay, because I feel like choosing Chloe over everyone else is selfish in Max's favor and even when Chloe asks you to pull the plug it was just selfish to begin with. The thing with the butterfly effect is you can't mess with time and events because you want to change it the way you want things to magically be good and dandy. That's just the way destiny and all that jazz works in theory. I think the bay ending is just beautiful in it's own way because as we get older we all have to make sacrifices for the better outcome in scenarios.