Welcome to the Forum. In selecting to go with a JLC you have chosen wisely, and I think you will not go wrong no matter which you choose.
If I had a wrist size like yours, I would go for the MUT (original 34mm version) without any hesitation whatsoever. Not even a single doubt.
You must decide how important the date function is, of course, but there is something really sublime about the time-only MUT in terms of its apparant simplicity. I say "apparant" becuse the MUT is actually a complicated watch, arguably the best ultra-slim watch made. The incredibly thin and wonderful movement is assembled in a special section of the JLC Manufacture reserved for the most complicated watches. I think it is a perfect dress or everyday watch. To me the ultra thin feature as executed in the MUT trumps a date function, a small seconds subdial and a power reserve indication. These are just my personal preferences, but that is how I would make the decision.
That said, Mercelo's photograph in this thread offers a very compelling case for the RDM.
Good luck with your decision.
respo
PS - By the way, your wife sounds very nice and generous. Is she married? LOL.