I've never found any difference in reliability between 1911's of Commander or the full length (5" bbl.) model. I do think that when you go shorter than 4" or so in bbl. length, there is the potential for problems. Spring strength becomes more critical for reliable functioning, as does feed ramp angle, and ejection port size and shape. Too, the stiffer recoil spring makes racking the slide more difficult.
Accuracy is virtually the same in the examples that I've owned. Truth be told, I shoot the shorter Commander models better than the full length ones; which I attribute to its better balance in my hands.
And, as has been previously stated, the lighter weight of the alloy framed Commanders as originally made by Colt, are a lot easier to tote around all day...this last from my personal experience. As to the oft heard comment regarding additional recoil from the alloy framed models, I've found it just barely noticeable.
Lastly, if concealment is the goal, as well as range use, the shorter bbl. is an asset, but in reality, it's the length of the grip that makes the biggest impact. It's just as easy to 'hide' a full length 1911, as a 'Commander' length model. Either will require a fairly long shirt tail to conceal if you carry OWB at the 4 o'clock position, as I do.
Experience wise: I've carried a 1911 since 1969, in peace, on the street, and in war. It's always met my expectations...short bbb.'d one now in my dotage, but the 5" model rode well when I had 20/15 eyes and big shoulders. A dozen Colts have come and a few have gone, as well as a pair of Rugers, a Remington-Rand WWll model, and most recently, a superb Sig 1911 RCS...all in .45 ACP of course...well there's still a 5" 9mm Series 70 in the safe that seldom gets out to the range.
Hope this helps, Rod