No, you don't need to break it out autos vs. revolvers. Both are handguns. If you carry a sidearm, what do you want? I'm not going to face my shooting need and call "time out - I need another handgun." That's not what this thread asks or is about.
I own or have owned handguns in .22, .38, .357, 9mm, .40, 10mm, .44-40, .44spcl/mag, and .45 Colt. usually two or more in each caliber. After decades of experimenting, loading my own, and shooting everything I could, I've narrowed it down to this;
1) In autos, I have sold the rest and have no use for anything but a 1911 in .45acp (but I still need 5 of them).
2) in revolvers, I still own .38, .357, .44spcl/mag, .45 Long Colt, and .44-40.
Of the 12 revolvers, 5 are .357. That has proven to be the most versatile cartridge in an external ballistic sense, as well as most manageable in the platform carried. I can carry a snub nosed medium framed concealed, a larger one in the field, or an even heavier round with bear loads for the largest predators. The ammo choice literally goes from plinking to bear, and I don't have to change springs, wonder if it will fire or cycle, or blow out my slide/frame/etc. I can buy the ammo or load it all in the same brass and shoot it out of any of the guns.
I love my .38s, .44's, .45acp's, my 45 Long Colt, but if I could only have one, it's .357. It does it all. I didn't read this in a magazine; I learned it through trial and error and careful observation over 25 years.