Wide open question. But a good one. Really depends on realistic anticipated use. First off, a running car or truck is a really good defensive weapon.
But I love my sxs. 20” does get more velocity but 18” is really handy.
Even with chamber mods and practice very hard to reload, hard to carry...
I walked out Sunday with a gentleman who commented in negative fashion about all the young city folk buying ar’s and “bullets” that they were completely ignorant of and had no business buying. His words.
The following weekend Atl has record shootings. Coincidence??
I believe all ga dnr ranges have safety rules ( may actually be laws). Even without RO’s. A call to dnr or leo might be a good idea.
Out in CO it is not uncommon for folks to use a air horn to recognize poor safety behavior at unmanned ranges. I once saw a very impressive woman go and stand...