Here is my 2 cents. I am going with the black one, waiting for QC pics now. Make sure to check QC pics before approving. There are a lot of QC pics in this thread, so just literally compare your QC vs others on this thread. In terms of TD, I think most of them are the same. You still need to do your QC. Other advices, don't pay with CC, pay with WU.
In terms of color, I picked black - I think it's the safest bet. The reason for that is I don't really like white, blue looks a bit different from current genuine 15400, but I think the current rep color is similar to previous gen. Also, on the blue one wait is like 2 years or more so it's more exclusive, more chances of being called out by people in the know. Besides that I have blue dial watch already. But a lot of people like blue 15400 here, so it's a matter of preference.
But this was my logic, and my preference. I think just pick the color you like, and go with it. You are buying the watch for yourself, and unless there is a guy next to you sitting with the same exact watch no one will be able to spot a difference.
Also, by the way, I was leaning to blue before, but went to AP store and tried on the black, and fell in love. Saw white and grey, they didn't seem that good on me. Was no blue in stock. Hence I am going with black.