To me, it depends on what side of PF we're talking about.
I'm a Gilmour girl when it comes to musicianship, sound and melodic sense. His guitar playing is what made me listen to them in the first place.
Roger is my man for his grand ideas and the forceful realization of things. He had a tremendous drive.

As for their solo outputs though, it's Gilmour all the way.

However, their solo stuff is a clear indicator of how much they needed each other to achieve what they did.