They are both good, but I think we cannot compare them because they are both very different.
The bitcoin wants to be a real currency, Paypal just wants to be a pay method and is not a currency at all right ?
Overall I do like the bitcoin more because its faster and also more secure and cannot get limited.
for me the difference is in the rules you have to follow. when using bitcoin there is none. but in order to use PayPal you have to agree and obey their terms of services.
just search how many accounts has been restricted and for the stupidest reasons in paypal.
Everyone has their own choice of course and that is quite logic some people works better with paypal than with Bitcoin so everyone has their own payment method.
Personally I like Bitcoin more because you can earn good money with it and you can also use it easy as a payment method but there is no difference in which one is better.