What I like about the white MC:
*Colors don't stand out as much against white, so they look more pastel and feminine
*Colors seem to show more variation (on black MC, the colors contrast brightly against the canvas, and it's harder to pick out subtle shade differences)
*Looks more fresh for spring/summer
*Items that look better in white MC, IMO: Small accessories with little/no vachetta (Koala, Wapity, Pochette wallet), Pochette accessoires, Rift, Shirley, Trouville, Alma, Lodge, Leonor
What I like about the black MC:
*Can be worn year-round
*Ages better, because vachetta will always be lighter than the canvas. Patina appears to be a nice, even honey color in contrast with the black, while dark vachetta on white MC often looks dirty or too old because it stands out too much
*Mole lining will not bleed like the raspberry alcantara lining on some older white MC pieces
*Items that look better in black MC, IMO: Small accessories with vachetta trim (Pochette cles, Porte-monnaie plat, French Purse, Porte-monnaie billets, PTI, agenda), Speedy, Petite Noe