Definitely the casinos because if they're not winning then casinos would've been a thing of the past plus most people that get into casino business are devious people that wouldn't blink or shed a single tear even if someone were to bet their whole life savings to a bet that they thought is going to bring them the win that they've been looking for in awhile now. Maybe on an individual level, we can say that gamblers are winning more but in terms of profitability in gambling, I'd say that the billions of dollars that the casino owners is enough to settle the debate on which side always wins, there's a saying that the house might never win always but it will almost always wins eventually.