They are both "buy as you go plans" that have different pricing structures. I am sure the result is a pass that is swiped at the entrance turnstiles that instantly bill your credit card account. Does that become an incentive or a disincentive? It is possible to think you're getting a good deal, but you could hesitate if you're short on cash that month. "Oh, I might just skip Disneyland because I have to pay to get my car fixed." Nonetheless, it is nice to consider these options."loyalty programs that reduce the prices the more you buy.."
"membership programs that allow buying at a steep discount in exchange for an upfront commitment"
I would prefer my pre-paid plan of buying a ticket book of admissions. You just need to redeem them instead of getting nickeled and dimed as I might feel with the previous options.
I still might think the ticket plans are not suitable if I can't stay for the whole day. The more you go, the more familiar you are with the place and you might not want to be there the whole day.