Stainless is more resistant to corrosion.
Stainless is pretty shiny and can jump out at someone even if they only see part of it.
My P07 has ambidextrous safeties. All the omega pistols have either ambidextrous safeties or decocking levers. And the P07/P09 are wider than that metal framed 75/85 pistols. Are the new P10 pistols the same width (slide/frame) as the P07/P09? Use the same magazines (these days).
You going to carry it concealed? Why not a Compact CZ, like a P01, CZ75 Compact, etc? They are a bit easier to conceal.
If it's open carry then the stainless really will shine at everyone you walk past.
Good luck with whichever pistol you choose/carry.