What is reliable enough?
What is accurate enough?
What feels good/fits your hand?
Will the type of carry you intend to use really conceal that handgun?
I like IWB on my right side. I believe (mirror and asking my wife to look me over) that the way I dress, the holster I use and where I carry conceals that P07 just fine.
I'm sure the FNS-C or the M&P Shield would conceal even better. But, getting back to the questions above, they may not fit as well as the P07.
I'm not saying all P07's are accurate. My 9MM will not shoot with my older .40. Just won't. Not with the ammo that shoots so well in my other 9MM CZs anyway.
Maybe hand fit/feel should be a part of "Can you shoot it well?"
Can't speak for anyone else, but for me two guns, same model, one 9MM and one .40, the 9MM will be easier to shoot. Maybe not easier to shoot well, but recoil and muzzle blast. Bigger the bullet, the more powder, the more recoil and muzzle blast for the same weight/size pistol.
Also, consider parts/repairs/aftermarket accessories/upgrades. I really like my P07 .40. I don't think they make magazines for them anymore. CZ got out of the .40 market in everything but a couple competition pistols. A lot of the small parts are the same. A Rami might be a nice pistol, how long will you be able to get parts for them? Hopefully CZ will be a better supporter of their products than SIG. FN has pretty much walked away from supporting customers who bought FNS pistols (Midwest Gun Works has a lot of parts if anyone here has an FNS).
Pistols can be like a lot of other things. What seemed perfect when you bought it wears thing on you after awhile and you find it doesn't quite fit as well as you thought. After awhile many of us have moved (at least once, if not more) to different carry pistols, different holsters, different lights, different rifles, different kayaks, etc, etc., etc.
Good luck with which ever pistol you choose.