Pump shotguns are like trucks. Chevy, Ford, GMC, Ram. Everyone has their preference!
Hold a bunch and see what you like. They all handle very differently.
The big two are Mossberg 500 / 535 / 590 and Remington 870s. Ithaca 37s Winchesters and Browning BPS have a small cult following. I dont like plastic shelled ones, like the Benelli Nova or Remington 887.
Im personally a diehard 870 Fan, I look up the barrel codes to figure out the year and buy Dupont era mostly. But 1990s to pre 2006 is my ballpark. The older Wingmasters are fantastic if you like wood and blueing. The newer parkerized finish does last, just get it good and oily the first time and let it soak a little. Post 2006 the parkerized finish and quality control went to **** so avoid those.
The stock on 870s just fit me better, theyre easy to disassemble and clean, and the steel receiver soaks up some recoil. Plus most of the 20 gauges are built on a 20 gauge frame. I buy every one I find between 3 and 350 in good shape. I also have a set Im building with multiple receivers and barrels cerakoted sniper grey. I MEANT to do tungsten grey buttt I was a little distracted and now Im too invested to change. Works awesome for sea ducks tho
I have one friend who said "you just learned to shoot one shotgun well and refused to ever change or learn another." Another friend said "Im pretty sure your autistic" when he realized I only had 870s for shotguhs