I'd post some of my comparison pictures again, including a 642-1 & G26, but pictures can be deceiving in some ways.
How the actual firearms slip into and out of the mouths of real pockets in various garments (slacks, jeans, shorts, jackets, coats, etc), and how they sit and hang inside those pockets (in pocket holsters), is much more telling and relevant.
Then there's the body shape of the wearer to take into consideration.
In my case, changing brands and cuts of different slacks & pants has a very noticeable effect on whether I'm able to safely, practically & effectively (and comfortably) pocket carry one of my smaller pistols or a S&W J-frame.
As has been said elsewhere, the square & blocky profile of a G26/27 does look like a brick inside one of my slacks pockets. Even setting that aside, I've experienced that they won't easily (or in some cases, at all) slip into my jeans pockets. My cargo shorts and many jackets & coats will work for the diminutive Glocks ... but my J frames, and my CS9, are much less obtrusive and easy to spot. The little Glocks are noticeably heavier than my Airweights, too. Even heavier than my 649, for that matter. They kind of remind me of when I used to carry my SP101 holstered, in a vest pocket.
The revolver cylinder is much better positioned along the length of the gun to make it seem easier to practically conceal, even in the tight pockets of some of my tighter jeans. The grip is easier to reach in and grab, being slimmer at the rear, as well as move it up & out of the mouth of the pocket while tightly grasping it with my hand. Not something I can do with my little Glocks in those pants.
Weight? The Airweights (and Airlites) have an advantage. This advantage can easily become a disadvantage when live-fire is involved, though.
Choose your level of acceptable compromise carefully and well, for
your anticipated and perceived needs, as well as
your clothing and
your level of skills. This isn't a one-size-fits-all sort of issue, I'd think.
The J's, especially the Airweights & Airlites, are easy to carry ... but can be harder to shoot, and that's probably somewhat of an over-simplification.
I prefer my J's when it comes to pocket carry in pants & shorts.
I prefer the little Glocks (SW999c, CS9, etc) when it comes to those situations when I want to either carry "more" gun, and don't mind the extra weight of gun & magazine(s) in jacket/coat pockets ... or when I want to carry a belt-holstered weapon.
I've often felt that many folks who found it "more convenient" to carry a little J-frame couldn't shoot it nearly as well as they could a subcompact Glock (or other compact/subcompact pistol). That being the case, how well were they
really served when carrying a dedicated defensive weapon which they might not be able to shoot well under ordinary range conditions, let alone under the conditions which may occur in an actual shooting situation?
I've invested a lot of time carrying & shooting revolvers over the years, and I've worked hard to refine my revolver skills because of the several J-frames and SP101 I own. I can shoot them well enough that I increasingly relied upon them for off-duty, and now retirement usage ... but I wouldn't have wished to have carried a 5-shot DAO revolver as a
primary duty weapon when I was working, actively involved in working cases and being sent hither and yon to active crime scenes.
This is one of those individual decisions that is easier to make when the individual carefully considers their own level of knowledge, training, practice & experienced ... their own anticipated situations and circumstances in which they feel they might require to actually use the weapon ... tempered by their experience and some common sense when it comes to risk assessment.
I don't make these sorts of decisions for anyone other than myself, and I've always looked at them as being affected by any number of variables, even for myself. I may have given myself over to carrying issued compact pistols for the several years leading up to my retirement, meaning I found the compacts better suited to my plainclothes assignment, and even acceptable when pressed into use for a uniform gunbelt ... but I didn't make that choice for anyone else. That remained for them to do.
What works best for you, in your daily life and activities, considering your skills?
Not my call.