In January of 2006 at the Bay of Dreams, Tom D told me his favorite hole was the 8th a PD.
I think I said that was my favorite hole that I'd ever designed. And it was part of my recognition that an architect has two types of favorites ... the ones that were always just there (like 7 or 13 at Pacific), and the ones where you really had no idea of the finished product when you started construction. The 8th at Pacific Dunes was one of the latter. The green was in a thicket of trees and we had no idea what we might build, and the inspiration for the green, the 3rd at Woking, came to me on an airplane headed to or from Portland. Those are the kind of holes you really love in the end. The 4th at Barnbougle Dunes and the 7th at Ballyneal are two others in that same class for me.
As for favorite hole ever, anywhere, I've had a few over the years. The 9th at Cypress Point was probably the first ... I played it when I was 15 and I was just mesmerized. Then for a long time I cited the 4th at Cruden Bay, because the first time I saw it was a spiritual experience, back in the days before Golf Club Atlas when you had no idea what each hole was going to look like.
For Paul Daley's book I picked the 2nd hole at St. Andrews, not realizing that it still needed some tweaking by Mr. Dawson and Mr. Hawtree to be perfected.
I'm one who has to keep finding new favorites. And, it's an honor to have worked on a couple of holes mentioned by others in this thread.