Taught by Hollywood?
As a firearms instructor currently for the fed gov't and Marine Corps, it always irks me when people make the claim that you don't have to aim a shotgun. The most tacticool looking officers/agents geared up looking like they're about to invade Fallujah fail shotgun quals from time to time. Most buckshot, the go to self defense load, is going to have a spread less than 3" at 10 yards. You still need to aim, but aiming is easier with a buttstock when shooting from a static position.
Long guns (shotguns and rifles), in general, have a much easier learning curve than pistols so it does make sense for a lot of people to select them as their first go-to defensive weapon. However, I always recommend
training and a handgun for home/self defense in the city and suburbs. The rationale behind this is a handgun is simply more versatile. It's not cumbersome indoors, you can easily conceal it which has MANY advantages, and it can be deployed quickly. The downside is it takes a lot more training to be proficient with a handgun than it does a long gun.
Since OP has LEO guidance, I'm assuming he's already recommended accessories and ammo. If not, I highly recommend a weapon mounted light for the Sig and Benelli. I can't cite the statistic, but off the top of my head, the majority of defensive firearms altercations happen in low light scenarios. Low light doesn't necessarily mean night or pitch black. It can be a parking garage, inside a house with closed blinds, etc... Target identification is really important for anyone about to pull a trigger. Legally, you will be liable for any round that damages property or causes bodily injury. It's good to know what you're aiming at before making a decision that's going to change your life forever.
Have fun finding a comfortable holster. All the air marshalls I know have drawers full of holsters.