Stumper,
Well, if you have XXL hands, the UG might be a tad snug, but a good chance still fine.
The RMD is more likely to be to your liking for fit. BOTH are VERY nice knives though. The RMD has been one of my FAVORITES for a long time now. And now the UG is a little different design with some over-lap in function. It is a SERIOUS contender for MANY of my personal uses.
If I had to be "SUPER"-picky, I might taper the sides of the handle at the pommel (little finger) a tad to make narrower at my little finger - this would provide a little more room and a bit more little finger squeeze grip at the same time. But, for me, the "Length" of the grip area from the guard to pommel - where my four lower fingers grip - is VERY fine!
Even with my "generally" XL sized hands, I can spread my fingers a bit at an angle and still have sufficient handle room. If I squeeze my fingers in tighter, I have an extra 1/8"-1/4" of grip area or so.
If needed, the UG's handle at the pommel could probably be reshaped to allow for a bit more room if you decide it is a user for you. You might be able to squeek out an extra 1/8"-1/4" in handle grip area length if needed. And by tapering the sides at the pommel (if needed) some extra comfort might be gained for XXL hands - or various other sized hands (???).
This is not a HUGE handled knife by Busse standards. But, it is a svelte slender knife that is just large enough in the grip area for 95% of the hands out there (I would guess).
Then handle and grip area of the handle is very appropriate IMO for this knife design. But, people's hands and comfort preferences vary a lot and make it tough for knife makers. Still, I think the UG is a winner.
You will most likely like the RMD for sure. The RMD's handle design is more "adaptable" to a WIDE variety of hand sizes because of the way the belly of the handle flares more gradually. Whereas the the UG's handle gives just a little more snug secure fit/feel/grip which is more appropriate for this style knife - semi-fighter, semi-slender utility knife - IMO.
.