Paypal is hassle to others because of security measures it's giving to their users and its just fine.
Bitcoin is easy to use because no security measures are given here.
Therefore, both are useful depends on the person's need.
Like here in my location, withdrawing cash is easy with bitcoin here so I will choose bitcoin. I don't have bank account that's why I can't use Paypal for withdrawing cash.
If you want to use them both that it really possibile because i know that bitcoins are hetting big in the future and that will always be because bbitcoins has that many users off course.