fsadeli, you should pick the color that is best for YOU. if you wear bright colors a lot, maybe neutral is better. or if you wear a lot of neutrals, then a bright bag is good to spice up your outfit.
i think tan and black and brown are best for neutral. i have some bright color longchamp, and sometimes they are just too much if I am wearing a clashing color.
personally, i like the limited edition bags, since they are unlike most people have. i have a millefiori (photo below!) from a few years back.