I prefer Stripe for developers' ease of integration and PayPal for providing the simplest user experience (i.e., improved revenue.) In my experience, neither platform requires a user register to pay via credit card. However, as noted, many people have a PayPal account, which allows quick and easy payments through a "more" trusted name.
I used Stripe and Paypal and settled on Paypal for the customer. However, the PayPal web hook back end is a complete mess (at least in PHP). Unless they have improved very recently, PayPal web hook integration is poorly documented and barely supported with bits and pieces of important code on GitHub and elsewhere. I can't speak for other languages. But given the popularity of Paypal (i.e., improved revenue), I decided to keep using Paypal after I got the web hook integration worked out.