It depends on you. Normally, progressive slots are geared towards rewarding max bets. And you can also be rewarded by free spins or bonus rounds. However, max bet requires big bankroll. Thus, betting max on slot machines does not increase your odds of winning. The winning combinations are completely random. Yes, slots are designed to reward higher bets. However, if you have a tight budget, you would not last playing slots. Here, you are wagering high per spin. Moreover, there is no guarantee that you will win on every spin.