Ok, this is for fun and opinion only. List what companies are best overall for each of the major calibers. Who makes the best. Since few of us have shot every gun ever made, some of the list will be experience and some research/internet lore. Do not get too caught up in criteria, you decide and feel free to share why. If I left a caliber out, forgive me and add it to yours.
.22lr Ruger (no contest here. SA & DA revolvers and legendary autos)
.38sp S&W (their pocket snubbies are the benchmark)
.357mag Ruger (beat out S&W because they have quality SA & DA)
.44mag S&W (the original and best)
45colt Ruger (sorry Colt, but The Blackhawk, Vaquero, AND Redhawk!!)
380acp Taurus(yes Taurus, they have pocket, double stack poly, all metal, and a revolver.
9mm Sig Sauer (never owned one, but based off their rep.)
40S&W Glock (see sig comment)
45acp S&W (here me out before you laugh. 3rd gen 45xx series, M&P, and quality 1911....and revolvers!
.22lr Ruger (no contest here. SA & DA revolvers and legendary autos)
.38sp S&W (their pocket snubbies are the benchmark)
.357mag Ruger (beat out S&W because they have quality SA & DA)
.44mag S&W (the original and best)
45colt Ruger (sorry Colt, but The Blackhawk, Vaquero, AND Redhawk!!)
380acp Taurus(yes Taurus, they have pocket, double stack poly, all metal, and a revolver.
9mm Sig Sauer (never owned one, but based off their rep.)
40S&W Glock (see sig comment)
45acp S&W (here me out before you laugh. 3rd gen 45xx series, M&P, and quality 1911....and revolvers!