at 6.75 inches, I think both watches would fit you well. Try them on and see for yourself. As a FOIS owner, I will say though that another factor to take into consideration is whether you will ever want to wear it on a bracelet. There are no official bracelets available for the FOIS but there are 2 general accepted Omega bracelet/end links combos that will work on it. But these will be an added expense and a bit of a hassle. The moonwatch is available with a bracelet out of the box. Besides bracelets, also give some thought to strap options as well. There is a much larger availability of 20mm straps (moonwatch) vs 19mm (FOIS).
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