I know this post is 6 months old but I came across it since I have an FXD (‘23) and looking at an IWC Spitfire Chronograph (IW3706 tribute). The IWC for me would be more of a daily wear. I have 7.5” wrists.
For your collection, I could see a Santos Medium white dial with strap choices as a formal piece that’s flexible for various occasions. Your Mark XV would still be a great daily, but a santos would close the core collection for you of 4 watches. Anything else is complimentary, or a beater.
Uptick did a nice long video with Johnny Guitar comparing these two after I asked on a previous video how they stack up to one another.
I own the FXD and compared both of these. I chose the FXD as I lean towards blue dial watches for divers, but also I preferred the looks and bezel itself and a countdown bezel for cooking, etc. I also appreciated the similarity to my Yacht-Master as a good balance to the relative bling of the YM.
I plan to pick up a U50 at some point however, as a counter to the FXD, there is a limited edition U50, the U50.S.BS that can be had for the same price as an FXD.
Also, Uptick did a video on the limited edition U50.
You don’t for the reference time, you’ll just have to know direction east or west for second TZ. As for the color, it’s useless, since color separation is only useful for 24 hour bezels, not 12.
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