Well, every single LEO I know tells me to have a shotgun for home defense, rather than a handgun. Every single one. A handgun is not practical for an apartment, as almost all handgun rounds will go through the drywall into adjacent apartments. And I don't subscribe to the "I hit what I aim at" comments either, because quite frankly, most who say that aren't being shot at when they're doing the aiming. A shotgun best suits my purpose for apartment defense.
Yes, I hope it never happens. But, on top of that, I hate handguns. I've owned almost every type and manufacturer of handguns you can think of over the last 4 or 5 years. Not all, but most. And I've fired several more that I didn't own. All makes and types. And I've pretty much hated all of them. So, I'm sticking with a shotgun for home defense. And, the more I study them, the more I think I might like to do some shotgun target shooting. After all, that's the only way I'm going to get any practice with it. So, I need one that can be used for at least one of the other styles apart from h.d.
Plus, as I said, I'm poor. The ultimate thing for me to do would be to keep the Express, use it at the clay/trap ranges, and the 590 would just sit at home in case it's ever needed. But then I'd never get to shoot the 590 and why have one if I'm never going to shoot it?
So I lean toward trading both for one better built gun in 26" or longer that will also have more available out there for interchangeability. Maybe I'll look at a Wingmaster and check the right handed safety out, see if I can manipulate it left handed. I could always hold the gun in the left hand, and flip off the safety with my right before gripping the forearm.