The PRS strings feel a little different to me. I actually prefer them to the D'Addario-branded strings.
I've got no axe to grind here; I don't use either one. I'm a pure nickel strings person.
I like Sonotone Vintage (pure nickel). They're brighter than most pure nickel strings, but still have that nice, round fundamental tone that nickel-plated steel strings don't give me.