I still have time to decide since I will not be standing in line.
Black looks good, no doubt. But put a silicone case on it and it will become a dark grey or some other color like red.
White is pure, but may be seen as a little feminine. Still I am thinking of a white silicone case on a white phone - may look amazing. In a black leather holster?
Lest you laugh, everyone will notice, and 2 years is a long time. Normally I probably care less than most about looks. The case is likely mandatory, since I have been known to drop phones, and have now had 4 phone replacements due to damage (2 were water damage)