The depth is very important but just as, maybe more, is the carve on the shoulder of the neck. The shoulder carve can make a narrow neck feel wide and a wide neck feel narrow. I think the NYC's have a nicer shoulder than the Metro's which give them a chunkier feel.
Thats an issue of preference not quality. Some people think a chunkier neck gives better tone. With an NYC you can get it made however you want. With a metro you get the production standard designed to please the largest possible number of people.
