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Deer hunting mostly. Also close range. We run dogs between the soy fields and typically ambush them between the game trails that run through the fields so shots are generally no more than 20 or 30 yards. Not too many hogs here in Eastern Va yet
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At that range the 18 1/2" barrel would do just great.
The short barrel guns are FAST on target and work better for this kind of shooting then longer barrels.
Assuming you're using slugs you'll need to do a little test shooting to find a slug brand and type that's the most accurate in THAT specific gun.
Most slugs will group into a pie plate at 100 yards and that's plenty for deer.
However, you're going to have to give some thought to sights of some sort.
There are a lot of options from buying a barrel with factory rifle sights and selling the standard barrel to help fund it, to having barrel mounted or ghost ring receiver sights installed by a gunsmith, to using some sort of mount to use a scope or red dot reflex sight.
I've just bought an inexpensive reflex sight and for closer range fast shooting I'm absolutely sold. It's faster than any iron sights or even scope.
You can buy scope mounts for the 870 that use the trigger group pin holes in the receiver to mount it.
Then you can mount either a scope or reflex sight.