I have an 8 inch wrist and wear everything from the Omega CK to a 47mm Panerai. Admittedly, the CK looks a bit small on me but with a NATO it bulks it up a bit and I'm happy with the look. I think my personal favorite sizing is 44-45mm case.
The GSOTM and Speedy Moonphase you're looking at are great options at 44mm. You could also look at the 45mm PO line. Lots of choices with 44 and 47mm Panerai. The AP ROO line at 44mm also looks and feels great on the wrist. JLC also makes a great ceramic chrono in either 44mm or 46mm.
Any particular features you want in your soon to be new watch? Chrono, diver, GMT, or price point?
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