I added Paypal to the list of payment processors on Liberapay. Before it was only Stripe, but they send me a mail that it needs more info, and i'm constantly having problems with it, so if this doesn't get resolved by at least november 10, i'll disable it.
If I disable Stripe, it will have some effect on payments. I guess most important is if someone has automatically renewing donations, that wont be possible any more. And donations will possibly be less anonymous (PayPal always allows donors and recipients to see each other's names and email addresses). For the rest, I don't think there's gonna be big problems, but a full list of differences between the two can be found at
https://liberapay.com/about/payment-processorsThe platform to go through remains Liberapay, so no extra accounts are required for donating.