I think it is elegant/dressy vs casual/trendy, see which style suits your wardrobe better or pick one to diversify your existing collections, e.g. if you don't have classic flaps, the clutch would be nice.
And also I think it depends on how many years you want use it down the road. Style-wise, I like celine micro better, though I am true to chanel. But I am not sure if celine luggage can elevate its way to classics, Chanel would always be. If you want classics--go with chanel, chic/fun---Micro seems better. I would like to get one but I have never got a chance to see Micro IRL where I live, but I hope I would see one soon when I visit Hong kong and Paris.. And afterall, both of them are beauties, good luck~~