I owned the pro-sapphire and recently changed to FOIS (sold the pro). FOIS simply seems more elegant to me with nicely polished time hands, blacker dial, nicely visible stepped outside ring and inner subdials. Also smaller case & straighter lugs speak louder to me.
I love the pro, no question about it, but for my style of dressing (mostly business or business casual attire) I find fois a bit more matching.
And then, with addition of after market flat link bracelet & see-through caseback I have perfect configuration of my FOIS
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