How do you connect the neutrals and grounds in a panel (both main and sub)? Do you strive for some kind of intuitive or pretty layout?

a) neutral immediatly behind the hot, skipping several screws
b) in order, starting at the top of the neutral bar - neutral for 1st breaker goes on first screw, etc.
c) random

Many panels don't have a neutral bar long enough to do option a.

One neutral/screw (until you run out of screws)?

Any proximity relationship of the ground with the matching neutral?

- les