Nut width and then string spacing, if forced to prioritize.
I don't find a skinny neck helpful for my old fingers, but I rarely find a neck that hinders my playing anywhere near as much as uncomfortable nut width/string spacing.
Of course if I'm spending my money it better have all three.
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Keith
Martin 000-42 Marquis
Taylor Classical
Alvarez 12 String
Gibson ES345s
Fender P-Bass
Gibson tenor banjo
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