I think that the bitcoin is on this moment better but that PayPal is more used because its just more popular, maybe in the future this will change, with the bitcoin there can be done a lot more too.
may be in some area the use of paypal is more that bitcoin, but to me i think paypal is regional and not universal, while bitcoin is universal currency, paypal service is not available every were and is also banned in some area, where as bitcoin is not banned any where.