That little SIG is a wonderful handgun. I had an old Colt Mustang that I really liked, but I was not real confident of it handling the most powerful 380 loads that i wanted to be shooting. I sold it and recently bought the p238. It's had nothing even close to a hiccup witj everything I've shot through it, including the dirtiest, cheapest available, to the hottest Underwood Ammo offerings.
That Glock 42 is the size of my Kahr CM9, so I'm not sure that is what you are looking for. I will say that the P238 is the same weight as that same CM9, but disappears when carrying much better, which is saying a lot.
For true pocket carry, its probably on the borderline. The LCP, TCP type guns may be better. But for a combination IWB\pocket carry type gun that is built like a tank it will be hard to beat.
By the way, while the trigger pull is slightly heavy, it is sharp and very fast. I prefer it for the way it is carried. Good luck.