PayPal is risky, cause customers can easily make disputes and if you can't settle it, you'll be lost of whatever you sell, and your money. However, for BTC, it's a one way transaction, and refunds are impossible unless you give them yourself.
So, if you use PayPal, be very cautious on what you sell, and make sure you make the sell legit in-case you need to provide any proof of purchases of them item that was given to the buyer. Digital products are not covered by PayPal buyers protection, and if you sell digital products then you can easily loose out on it all if you don't protect yourself.
However, good luck and hopefully you can do good business without having anyone commit any fraud.
