Not all that many years ago I carried a 1911 or a 1911 variant. My large capacity but smallish 1911, a Kimber Ultra 10II (ten two) held more ammo and took it’s big brothers magazines. But then the threat changed with the muslims and their terrorism. So I changed at that time. It just so happens that with the latest threat of anarchists and domestic terrorism what worked back then also works now.
I was competing with a S&W M&P so I bought a M&P 9c. It was smaller than the small 1911s, and held a higher round count of 9mm goodness. I carry off body and between the mag’ in the grip and a spare mag I have something like 40 rounds. Until war is declared on the enemy it’ll just have to do. But I do have the option of bringing more mags along.
Once I can carry a slung weapon it will be something with at least a 30 round magazine. FWIW, when we leave the house for something other than errands I bring “another” weapon, cased of course, but with loaded mags and a can. But what I bring is short so that if I have to it can be used in the auto.
When we go for walks I take a KelTec cp33 with at least 20 rounds in the mag’. But that’s brought along for 4 legged vermin (mostly) and due to the ultra light weight. But I reserve the option of bringing along a more capable slung weapon, and I have.
Today if I was in the market for a small and highish capacity handgun I would seriously consider the Springfield Armory Hellcat. It’s as small as my SIG P938 but with a double stack mag’ so is somewhat thicker. I don’t know if there are larger mags available for a spare, but that would be high on my list of wants.