I have a Remington 870 Wingmaster that my grandfather passed down to me. He only shot it a couple times before giving it to me. Since then I have done nearly everything with it.
I have a full tactical home defense setup for it. Magpul stock/fore end. tube extension, 18 inch all purpose barrel, and other little things.
But now since duck season opened up, I have switched it back. It takes a matter of 5-0 minutes to convert it to a totally different gun.
Unlike the mossbergs (other competitor is the >600 range) The remingtons are sturdy. The mossbergs have a different setup, trigger, and more moving parts. The remington has 2 pieces that pop onto the slide rails and you're done. The trigger assembly drops out when you punch the two pins out.
super easy to clean, super reliable, and TONS of options.
I can go out and shoot clay, hunt anything from deer with slugs to duck, pheasants, and other smaller game. Then after I get home I can sit down, break it down to clean it, but put my home defense parts on it in the same time it would have taken to put the hunting setup back on.
I have always wanted a Benelli Nova, but after 5 years with my 870, I still don't have anything else. All of the parts/accessories I have more my 870, plus the retail price of the gun still don't add up to the price of the Nova or other competitors.
However, bottom line is that the 870 is a pump, while many of the aforementioned models are all semi auto. My philosophy is that you can have the fastest auto-loader in the west, but if you can't aim it, you're not going to hit shit. The great thing about a pump is that it makes you practice and perfect your aim, cause you only have one before you have to rack a new one and possible lose your target sighting.