Paypal no longer allows users to make credit card payments without an account[1]. Prior to this, paypal gave you access to an audience of anyone with a credit card. Now that they don't, your low-friction audience is restricted to people with actively used paypal accounts, which is pretty much 15-30 year old guys, and no one else. If you know anything about online sales, you'll know that any increased friction at checkout is a bad thing. Requiring people to make a paypal account at checkout time is probably dropping 20% of all customers and 70% of customers over 50. If you wanted to know why physical shops still exist, that's why.
You get a vastly wider reach with plain old Visa/Mastercard support, because anyone with a credit card can use it, no signup required. All adults have at least a Visa Electron (or regional equivalent), even if they don't have a real credit card, because that's what banks give out by default these days. Hell, most children will have them.
Normal credit card support is fine.
[1] By default at least. Paypals documentation[2] states this is still possible, but I haven't seen it work on any paypal shop for around a year, so either it's broken and they don't care or maybe no one reads the docs?