Paypal is what I have always used. I find it quick and easy to access and like the fact that so many places online take it as well for payments. I can even go to a store in my area and pay with my paypal account, which is very convenient. Paypal is what I have trusted since I started my online presence and it is what I will continue to use most likely forever.
I am currently using Trriple because even though I don't have any credit card or debit card to link in it I still have other ways to spend my money by purchasing items and balance to pay for it. I am using it to receive and send the payments to people around me.