I personally like the Keltec RDB. Short enough to travel in my tennis bag, weight distribution is moved back so it is easy to maneuver especially around corners but still has the 16” barrel in case you need to reach out a little further. Plus having the cases ejected from the bottom keeps trash out of my eyes. But if you really want to have some fun get the KSG 12 gauge with 24 short shells! :0) I don’t want to knock AR pistols though, they are great tools and I practice with both platforms.
You and I have such similar taste in firearms it scares me sometimes.