For years, I have always preferred the more modern, slim shaped necks and flattened out fingerboards on both guitar and bass, up until recently. I think mostly because I had poor left hand technique where I would grip the neck with my thumb either going over or hovering above the E string. I hated larger neck profile because of this, just felt way too big. I started getting pain in my left wrist recently if I played longer than about 30 minutes and had a friend show me a more proper way to use my left hand with my thumb behind the neck and my hand in a more comfortable angle. So once I switched up my grip, I found that the slimmer modern necks (especially with smaller nut widths) that I used to prefer were now uncomfortable to play. The edge of the neck just hits my hand in a weird spot now and I don't like it. A few weeks ago I played a Les Paul with a rounded 50s neck and found it very comfortable. So I wondered about the same for bass but no one has any with larger necks in stock around here. So I ordered a super cheap P bass online with a 42mm nut and more of a rounded U shaped neck to try it out and find I much prefer it to the modern C/Slim Taper necks. Strange because I have smaller hands, but go figure. Now I will be looking for more larger necked basses, there just don't seem to be too many outside of going with a custom build. Which do you prefer?