At first I thought this a waste of mental effort and undue cause of stress, as it would never happen. But then I realized I (and perhaps others) have already asked and answered this very question.
Anyone can buy these right now, if they are willing to pay over msrp from a reseller. Granted, there are fewer 321s but they are available. Since I have been lusting after a new Ed White and have been checking with OBs about getting one, I guess the answer is the Ed White over the Pepsi.
This is not an easy question to answer, as the GMT is a favorite of astronauts and space watches are what got me into watches in general. A 1675 is a bit of a grail, even though it's mass produced.
Going back to the OPs question, the real answer is more like neither, as I bought other watches instead because either I liked them better or they were better values.
But come on, that new Ed White? I might become a money laundering dope dealer just for the opportunity to buy one at msrp. If I have to pay 20K for a choice between either one, Ed White. Then keep looking for a 1675. But for 20k, there are sooo many other watches.