I run 1911s exclusively and have EDC'd every size slide length and frame/grip combination from full-size to CCO to the Colt Defender I was carrying today.
Barrel length is not a limiting factor for carry, as within reason...6" Anacondas and other such non-combat hunting & competition type barrel length handguns excluded.
The key for person to person concealment and comfort is the frame.
Grip width as in relation to hand size and finger length (so as to be able to reach the trigger). Also as per the size and shape of the wearer how hard or easy it might be to conceal a grip with magazine (non-flush type) as below your specific outerwear of the moment.
Depending on the person, the clothing you might wear and the specific place or activity you might be involved with while carrying is what affects carry capability as related to gun sizing.
Barrel length is meaningless to this end AND having a longer barrel thus with longer sight radius is to the shooters benefit.
Exclusion to the above would though be those who have need to pocket carry and have no other discrete means to carry concealed, such as professionals who must wear tucked shirts when on the job.
- Janq has been wearing a gun as concealed, exclusively, for nearly two decades now