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asym.....

I don't build, but when I had a bass built I asked for an asymmetrical neck.

The benefit to me as a player is that it made it easier to navigate a fairly wide neck. The neck being thinner on the treble side means that there is less 'meat' to have to reach around when I'm playing on the E and B strings. As my fingers get lower to access the D and G strings, my hand rotates around a bit and the thicker upper part of the neck kinda fills my hand up comfortably. On the A string, it splits the difference.

It's not a huge difference from a standard neck, but it's noticeable and I find it very comfortable to play on. I had previously owned a Tobias bass with an asymmetrical neck and that's how I became familiar with them.
 
Me too - my main player is a Tobias 5 with the asymmetrical profile, and I like it so much that all of my home-builts have a similar profile. I have smallish hands, so it really helps me wrap my fingers around the neck.
 
since so far i've been building just for myself, i never thought about profile, just kept shaping and checking by touch. but it always comes out asymmetrical, more D profile on the lower side to feel some mass and a bit flatter C skewed upper side to create the less curved surface for the thumb. this is for the 5 strings, maybe some alternative 4 string hollow fretless that i have on my mind. for JB type i just love old classic full C.