When I started out I liked a thinner/smaller neck profile, because it felt more like a bass guitar, with which I had more experience. However, the more I played DB, I came to the realization that the thin Kay neck was actually less "comfortable" when trying to keep my left hand in a natural C shape. When I had the chance on my current bass, I had a new, thicker fingerboard put on, so that the neck ended up with a nice fat profile. My speculation is that adding that much more mass to the neck gives the string a more stable platform which results in more vibration being transmitted to the bridge and then to the top.