As a backup gun the revolver is a better choice. The S&W 442 or 642 are perfect for this type of carry. Lint and dirt can't get in and the revolver is much more forgiving for deep cover concealment. I am retired 30 years LE carried backup a couple of ways in ankle rig and in a vest holster. The ankle rig is faster but picks up a ton of dirt and moisture. The revolver is harder to shoot and you need to get use to the heavier trigger compaired to the Glock.
Being retired now, most of my carry is a revolver snub and when I qualify with the department I use my S&W 36 and Colt Cobra 2 inch guns. I shoot the auto course for the SOU team with a snub and keep right up, and will outshoot most of the Auto shooters using Glock 40's and 9's. Don't get me wrong I still like auto's but at this time in my life the auto's are too big and the snubs always work.
Being retired now, most of my carry is a revolver snub and when I qualify with the department I use my S&W 36 and Colt Cobra 2 inch guns. I shoot the auto course for the SOU team with a snub and keep right up, and will outshoot most of the Auto shooters using Glock 40's and 9's. Don't get me wrong I still like auto's but at this time in my life the auto's are too big and the snubs always work.