N-Frames are perfect for open holster carry, or as range guns. LEO's seemed to love their 6" 28's. They are more durable and nearly indestructible in their .357 chamberings. It takes quite a bit to shoot a 27 or 28 loose.

K-frames are the perfect all-around utility guns, IMO they are not suited to constant use with .357 for those versions, but with .38's are the best all purpose size and last a long, long time if used reasonably. I conceal carry a 4" M10 HB with no problem, I like having that 6th shot and longer barrel for added velocity, over my Model 60 1 7/8".