With all that said, the one pump shotgun that in my humble opinion is the best of all is the Ithica 37.
True...
In regards to Mossberg verses Remington... prefer Remington. Had both, and recently sold my 500 JIC2. It was a nice gun, but bought it for a compact shotgun... so didn't mind how crappy the action felt. Got a KSG (mainly for fun, as was the 500's purpose), so decided it could go... as I really didn't have a need for a pistol grip shotgun.
I've shot Remington shotguns for years. Hunted with 11-87s, but my predominate defensive shotgun is my 870 Police. I prefer the controls, and do like the way you can empty the chamber without sending a round out of the tube (works of the Ithaca the same way, which is why that above pictured gun is my backup to my Remington). While the Mossberg safety is nice for lefties, I can manipulate the Remington safety a lot faster than the Mossberg.
With designs, I love the Ithaca. Mine was a Ducks Unlimited Guide Gun (actually an 87), which I picked up to use the stock for my father's identical shotgun. His had a crack in the wrist, so I swapped the wood. Stripped both shotguns when I did that to make sure they were cleaned... and I did hold the stripped receiver by itself. Reminded me of a stripped Garand receiver... something built to last, when quality was a big deal to manufacturers. I do like the bottom eject, and I sort of sided with the KSG, since it uses a design heavily influenced by the Ithaca 37.
When push comes to shove all these shotguns will work for you. Hell, my IAC 97 or Century PW87 will work if I needed to use them. Mossberg or Remington... really comes down to personal preference. Glock or M&P, 9mm or .40, paper or plastic, insert any other debate.