While no single gun-design will be perfect for everyone, the compact G26 with its standard 10-round magazine is worth considering for concealed carry. Shooting a G26 before buying one can be very informational. Borrow one from a friend or find a range that has a rental. Some experienced shooters will insist that, since the pistol size is the same, the .40 caliber Glock 27 is a better choice than the 9mm Glock 26. Try them both and let your tolerance of recoil help make that decision.
I find the 9mm Glock 26 easy to manage with +P+ loads while the new shooters I have dealt with almost universally do better with standard pressure loads. There are many smaller 9mm pistols on the market, but the G26 is as small as I care to go for the caliber. The G26 reliably feeds all brands and types of ammunition that I have used; I cannot say the same for the smaller 9mm semi-autos that I have tried.
Some people labeled the Glock 26 as “the pocket Glock.” The G26 is similar in size to, but not smaller than, J-frame and D-frame revolvers. A G26 may fit into your pants pocket but it does not fit well in mine. The contours of the revolvers make for better pocket carry in my world. I find even the Ruger SP-101 easier for me to pocket carry than I do the G26.
I have two holsters that meet my needs for the G26. From the low end of the holster market is the very affordable Fobus paddle that I find perfect for the weather and hazards of kit gun use. For concealed carry (Illinois requisite legal disclaimer; only while on my own property), I really like the Del Fatti SSK-HTL. The holster you choose should be comfortable, hold the pistol securely positioned where you want it, and it should protect the trigger. Regardless of what you have seen on the movie screen, it may be best to NEVER tuck a Glock (or ANY handgun) into your waistband, purse, or pocket without a holster to protect the trigger. When holstering, always make sure you are not tucking your finger, shirttail, jacket drawstring, holster strap, or anything else into the holster along with the handgun. Holster quality matters a great deal. When holstering a handgun, catching the trigger on the side of an ill-fitting holster could make you famous.
Most new shooters that test my G26 do not like the long crunchy trigger; to get used to it takes time and effort. Some knowledgeable folks recommend having Glock triggers altered for a lighter, smoother pull. I prefer my Glock triggers to be as they came from the factory.
The more often I use my G26 the better I shoot with it and the more I like it. Because I shoot a bit better with the Sig 239, I marginally like it more than I do the G26. Without the Pearce magazine grip extension, my grip on the G26 is about one and a half fingers; my fingers are a bit too fat for the available grip area. The Pearce extension makes the little pistol easier for me to live with.