Datejust 36 or Datejust 41 for Smaller Wrists

[Generation]

My wrist is on the small side, and I am having a tough time deciding whether the Datejust 36 or Datejust 41 would fit me better. I seem to be right on the cusp, where there is no real clear answer. This is annoying.

To add to the confusion, I can't tell whether I have flat or round wrists.

I just measured my wrist, and it is 6.5 inches (16.5 cm). I plan on losing 20 pounds, so I imagine my wrists will get significantly smaller -- perhaps as small as 6 inches (15.2 cm).

Attached are two pictures that show my Tudor Black Bay Fifty-Eight from the top and side. It seems the BB58 is comparable to the DJ 41 in the lug-to-lug measurement.

What do you think? Could I wear both the DJ 36 and DJ 41 comfortably? I'd prefer to get the DJ 41 because I want a white dial with sticks, which isn't currently available as a DJ 36.