My favorite neck is on my 1986 EBMM Stingray. It's a trans-era; one of the first of the Ernie Ball generation. The neck has a poly finish, not the newer wax and oil blend (which is awesome as well). It's also super thin from front to back, and I believe the nut width is 1.75".
It's extremely comfortable; my only concern is that it's really, really unstable. The trussrod frequently needs readjustment to maintain the proper relief. Also, it's so thin that if I lightly touch the face of the headstock without even really pressing, it'll bend the note out of pitch. I'm amazed that it's gone these 22 years without warping.
My second-favorite neck is a modern graphite-reinforced Fender P-Bass neck. Stable, fat, comfy, all that I need.