To me the most important issue is reliability. while there are officer's acp size and shorter guns that function well, in general the shorter the slide/barrel, the more likely a gun will have reliability issues.
The guns with officer's size frames and 4 inch barrels are a good compromise.
I believe the Springfield Champion is Commander length.
My Favorite Commander sized gun.
Concealment is accomplished by good holsters and a good belt. Anything in between is usually a poor compromise.
I've gotten rid of all my Officers size guns and sold the last one about a week ago. Wilson Combat makes good 7 rd mags for them btw.
"Now my Colt is currently serving in Iraq with my son" patriot:
I never understood the rationale behind the commander. It does take a bit of creativity to conceal a full-size 1911, but I fail to see where a 4 1/4 inch barrel yields much improvement over 5 inches for concealment. On the other hand, I can see where an officer would be significantly easier to hide.
+1. in general, parts sticking out in your pants tend to be noticeable, while parts hanging down aren't....
I do think the commanders come out of a concealment holster a little easier. I also like the way they balance.
What I don't get is putting a magwell on a 4" gun. That really defeats the purpose. Those guns need the back of the mainspring housing rounded off a bit. Or better yet a full bobtail or roundbutt.