Can't really help you with Code vs Night, as I don't remember what Night smells like, but White is in my opinion a very nice, clean (not aquatic!) sour bright white musk scent. Quite different from Code, actually, good for summer I think. Used to wear this as a signature and I'm thinking of getting something like it again for summer.
Besides that, I somehow have the impression that the Armanis tend to be very skin-dependent, so different people will get different results, which in turn means that a blind buy is a higher gamble than usually.