Personally I prefer BTC because it doesn't send your house address and what not via payments, but sometimes it gets annoying when I want to buy something online but they don't accept BTC. What do you prefer: PayPal or BTC?
Bitcoin is better when you want your information to be private but with Paypal it is just a bit easier in my opinion. Paypal is also worldwide more accepted at online websites and stores.
Paypal is taking advantage of its seniority as bitcoin is still very new to many countries, and Paypal is more popular as all website accepts, but things will change in future when bitcoin becomes more popular.