While concealment is important I disagree. A totally concealed small gun is fine unless you cant get to it when you need it RIGHT FREAKING NOW and if you cant hit squat when you do get it out.
I go with conceals well but shoots better as my criteria, it's easy for me to dress around a bigger gun, YMMV.
My journey started with a Sig P220 and P225 10 years ago. It has wandered quite a bit into the plastic game (Ruger SR9c, CZ P07, Glock 26,19,23,17,21,19X), waffling into various 1911s and settled for now on a different sig, 226 Legion SAO.
My true love is the 1911 in .45, but i continually find i shoot double stack 9mms faster and more accurate at speed. Double stack 1911s dont quite work, either in concealment or while shooting, sadly.
I feel that in my future a Wilson EDC X9 will wander into my carry holster, but that day is far off yet.