4Js
1625
A few additional ideas
While I own a duometre chrono, the lunaire is a different beast. You haveto want the combo of the foudryant on a moon watch. I prefer this on a chrono it is a large watch as compared to the FPJ and Lange. I Have no experience with your GP. But Journe and Lange are fantastic finish watches.
Are you considering both newest versions of the watches? The Journe with a 24 hour display provides a great contrast to the right regular time side. The crown at 4 is where you synch the seconds. It is a wonderful feature to eliminate the problem described. I like the fact that you can have a dual time zone watch or a day night display feature. Are you looking at the latest release Lange1 moonphase? Or the original? That comes down to personal taste preference, however, there is a large price difference between the two Langes.
Does the difference between white metal and RG have a meaning for you ? Why did you not consider the platinum Journe?
In the end, both are fantastic brands and great watches. How each feels on the wrist is another important piece of the process. Winding crown placements are another factor. Journe is totally unique.
Enjoy your decision making process
Best,
Joe