I would say that your BEST bet is to try what fits first. I myself have grown up on the 870 frame and ANYTHING different in a shotgun confuses me lol. Obviously I am biased, BUT the one thing that I can say is that a reliable pump shotgun is hard to beat for a few reasons.
1)Intimidation factor. When things go south and you are able to get a shotgun out inside of an enclosed home...that sound is probably one of the scarriest sounds on earth. It says, "Hey Do you feel lucky?" Let's face it that you would rather them just LEAVE than have to actually kill them. At least I hope you do.
2)Having hunted for MANY years with an 870 in Mississippi I can tell you that an unexpected rainstorm comes across a plowed muddy field where the temp is bouncing up and down around freezing, that of the 8 shotguns that were on the field the only 2 working were the 2 870s(nobody had a mossy so I cannot personally say anything about it, but I am sure it would have been fine). The Beneli, A5s, and over unders were not really happy to be outside at that point in time. But TBH you will never have that gun in THAT condition if it is a home defense weapon.
2 Short Version)I trust the pumps because hey are very unlikely to have an issue with ejection or workings, at least on the proven models of pumps.
3)PRICE TAG!!!! I can pick up a used 870 for how much? $200? $150? It is hard to sell the gun anyway because everyone already has one. Also the price on anything else you want. You can shoot any ammo you want (birdshot to buck shot) because YOU control the ejection and not the gun. Way more in terms of accessories as well.
Short version of this whole post is that you are best to go with what you are good at, but remember that there is a reason that everyone has an 870 or mossy in the cabinet. It is cheap, easy, and reliable.