Stripe isn't better. Dispute processes with digital goods are really hard. I'm fairly sure that the evidence that you submit (to paypal or stripe) is actually evaluated by the bank that the customer filed a dispute with. I don't think this kind of thing can really be held against the payment processor. Every bank probably has it's own processes and standards and every payment processor likely feels the same frustration that we do.

It used to really frustrate me when we would get stripe disputes. Now I have a collection of materials I go out and get, and then just send it out hoping for the best. I try to look at it more like rolling the dice than a business process. It seems to be consistent (in that sending the same materials for similar disputes yields the same result) but it is not at all transparent or an exact science.