I think the constantly changing curves of the revolver hide better than the corners of the Glock. I normally carry 8 rounds of 40 S&W in the Glock and can reload it much easier than the 5 rounds of 357. But I don't spend much time in cities. Almost never at night. I don't have a lot of scenarios where I could see me shooting more than 5 rounds.
And for a "get off me" belly gun, the S&W is very hard to beat. As shown, it has a big enough grip to easily grab, and will fire when shoved into someone's gut. I think, at least. I've never tried it...and Lord willing, will never need to do so.
In 40 years with revolvers, I've had light primer strikes in a 686+ from a strain screw coming loose. Loctite now. I had one time in a night-long sand storm where enough dirt got in my Dan Wesson revolver that it wouldn't fire. Maybe the Glock would have handled it. Don't camp out in sand storms any more. Prefer beds in motels now.
The Glock 27 is a good gun. I'm just not sure it does much that the J-frame with oversized grips doesn't do better.
The Lady Smith, BTW, has a great trigger. Smooth, but long and stout in DA. Makes me laugh when people talk about an 8 lb trigger pull as too hard. In SA, it is very crisp and precise.
Hammer vs hammerless?