Not op, but my 2 cents.

Stripe's developer UX is godly, from api docs to the dashboard it's something all B2B companies that offer APIs should aspire to.

Secondly, with stripe elements it can be styled into the website much nicer than PayPal buttons.

PayPal does support more countries and still has some brand recognition with customers as "a safe way to pay online", but between the bad UX for both business and developer, as well as their tendency to randomly freeze accounts, we try to dissuade clients away from it unless it's a significant revenue stream.