In our house we have a Remington 870 (mine) and a Moss 88 (the husbeasts) They are both 12 ga. The Moss has an 18 1/2 inch home defense barrel and I believe the 870 does too but it has a piece of metal with holes drilled in it mounted over the barrel so I can't read it. They both take 2 3/4" or 3" shells but the Moss carries one less shell than the 870.
They both do the job, they both have affordable price points, and I don't know if ours have the fancier options with the different chokes and whatnot. I'm sure that they could be used for hunting without any problem, but that's not why we have them so we haven't investigated it.
My 870 is heavier because it has a wood stock. The Moss has a synthetic stock and the hubs also has a synthetic pistol configuration for it. My shoulder says the Moss kicks harder, I would imagine because the stock is significantly lighter, and the pistol configuration is much harder for me to control when firing and slides all over when stored in our gun cabinet. Or behind the fridge for that matter. There are ways around the storage issue but it's not important enough to us to bother with so it's kept in it's regular stock. I do believe that 870's also have synthetic stocks available if that's what you want, I favor wood stocks although I will concede that the synthetic stocks seem to handle a beating and water exposure better. The Moss has a green fiber optic type sight on it that I like, the 870 has a gold bead and a flashlight mounted under the barrel.
Other than what I've said it's pretty much six of one, half dozen of the other. My kids were working with the shotguns the other week and even the 8 year old didn't have a problem with the extra weight of the 870.