... Are you comparing the ammo capability? The gun? The combo of maximized both? Until you define the test, the variables can't be ruled in or out.
Exactly right! And that's not all that people compare - I suspect that a majority of people who buy a 10mm instead of a .357/.41/.44 magnum do so because they prefer auto pistols (especially true for younger shooters), or simply because automatics tend to be cheaper than revolvers (something most shooters consider). And the claim that you can send more rounds down range, faster, with a 10mm might be better phrased as: "Stick with a firearm you can control."
Speaking of which, people are constantly buying guns they don't need - that's one reason gun companies, and magazines that publish gun stories, stay in business. Years ago, I used to go shooting with a fisheries biologist from Texas (an A&M guy, not a "tea sip" ;^). One trip to the range, he showed up with a brand new .375 H&H Sako in an Mannlicher-type stock, with a Leupold low-power scope mounted - an absolutely beautiful rifle. He explained that it wasn't quite new; he had got it for a couple hundred bucks, from his next-door neighbor. His neighbor had bought it years earlier, because he wanted a rifle that could handle anything in North America, and maybe a trip to Africa, too; after reading a lot of books & magazines, he bought the Sako rifle & Leupold scope.
One trip to the range was enough - he fired three rounds, took the rifle home, and put it in his closet (my buddy had also received that original box of ammo, with 17 live rounds & 3 empty cases in it). It sat in that closet for years, until he sold it to the nice guy next door from Texas. We all know the moral of the story - 'not the right gun for that shooter'.
But we still see these silly articles, "which gun/cartridge/loading is better for (fill-in-the-blank)", and then somebody will opine that "Oh, yeah, (fill-in-the-blank) is the best for (fill-in-the-blank)", forgetting once again that one size never, ever fits all.
FWIW, my friend from Texas loved that .375! He shot up most of that box of ammo while we were at the range, and told me the recoil wasn't as bad as his .300 Win Mag (which I was used to ;^). He actually talked me into shooting his new .375 - and I
almost got a case of "scope eye", thank you very much! It was definitely the right gun for him, but not quite right for me.
As always IMHO, FWIW, YMMV, etc., etc.