The answer to this is, IMO, how the neck makes you feel when you play it, and that's a function your motivation for the build. My build algorithm in order of importance....
1: Neck: Dimensions? Wrong profile = wrong neck, there's a certain ratio of depth-width that i like, jazz necks that are too narrow/deep and precision necks that are too wide/shallow are both out
2. Neck: Feel and function, how fast is it, how sticky is it, is it easy to fret, does it play well? Does it make me feel good?
3. Body/neck joint: Is it tight, does the bass sing unplugged when the neck is attached to the body, does it feel tight and stable?
4. Action: how close can I get it to almost zero without shims etc? Will probably never play it that low, but I ned to know the neck is good enough to go there if I wanted to
5. PUPs: is there magic when I plug it in (to one or other Mesa rigs that is)?
6. Circuit; does the roll off work for me, does it give me the tone control I need?
So the neck is critical to the first three criteria in importance, and not something I leave to chance, whilst bodies and bridges are not even a factor, which is why I'm happy to put a Warmoth neck on a Squier body with a BBOT bridge) 👍