Whether or not a carry gun is comfortable or not depends more on the holster and where you carry it than the gun itself, unless you are trying to carry a gun that is too big for concealed carry. I agree that the most important thing is how well can you shoot the gun consistently which means you should shoot the gun or one like it before you plunk down the money to buy it. There are so many choices out there in quality concealed carry holsters a person should not have a problem finding one that does the job. The rig must be comfortable, no doubt and in all the situations you will be in, sitting, riding in a vehicle walking etc, if not you will take it off and you won't have it when you need it. Of course you should practice bringing the gun to bear on a target from the holster you plan to carry the gun in and then practice regularly and if possible throw in some shooting under stress several times a year to find out what happens when you are under stress. Next for me is the caliber, I like a large caliber, .40 or .45, you will be able to shoot some brands better than others because of the distribution of the recoil in some guns is better than others. If you can't handle a large caliber, a small caliber is better than no gun. I never felt the need for a high capacity magazine, you can't shoot fast enough for poor marksmanship. That said, the agency I worked for for 33 years switched to Glocks in .357 Sig caliber about a year before I retired. That caliber is a good consideration as it packs a lot of punch and the grip is manageable to folks with small hands and it is rarely mentioned when people start asking about calibers.. The gun also must be reliable, it should go bang every time you pull the trigger, if it doesn't it is no more than a hammer.