It's also easier to buy on Paypal since banks trust them and most people have some PP income already.
Not all banks are too trusting in online transfers like PayPal. There could be some times that a teller or the bank itself will question your transaction there. And if you'd mention crypto, bitcoin, etc. there were some cases that they're considering it as a red flag.
I don't know where you are living but I'm very curious to know in which country banks trust more crypto exchanges than Paypal. It's the first time I read such a thing to be honest. Cryptos are unfortunately still unavailable on Paypal in Europe, so I don't know how it works actually but if Paypal allows you to make purchases with your Bitcoin balance then it's ideal because you don't even need to exchange your cryptos for fiat and to make withdrawals towards bank accounts, or to buy gift cards with your cryptos in order to make your purchases.