I've got 2 American Standards. The older one (late 30'searly40's) has a beefier neck than most Kays I have played. The more recent one (late 50's-early 60's) has a smaller neck.
I've got pretty big hands and the medium necks (where I would classify mine) seem to work better for me.
There was some discussion about this here before, small vs. larger neck size. While the very small Kay necks feel like butter when I would first pick them up, I would often end up with cramps, due to the smaller size.
That's just my opinion. I ain't no bass god.
