I doubt I'm completely objective about this, but here's some long held and informed opinions....
What we call autos covers a few different styles and designs. There's few universals, but there are some common probs, and non common advantages to some designs.
Gas autos have that reduced felt recoil thing going. This is a MAJOR selling point for obvious reasons.Blowback operated autos do not have the major reduction like gas autos, but do have some reduction and tend to work in worse conditions.
All autos are dirt sensitive. Newer designs and better cleaning methods have improved this, but no auto I know of will continue to function in conditions that many pumps will handle.
Autos tend to be more ammo sensitive. The old A-5s worked wonderfully well with heavy loads, but oft glitched on target fodder.IOW, the pump has a greater variety to its ammo.
A decent 12 gauge pump can handle anything from 3/4 oz, 1000 FPS cream puffs to the barnburners.
And while I've not seen an auto with a clean, crisp, safe 3.5 lb trigger, I'm only 56.
As for one handed firing with autos, try it. Some autos will glitch up if not pulled back hard into the shoulder cup.
As for prone, I've shot pumps prone, and had little trouble so doing.Worst I can say is the support side elbow abrades.
IMO,an auto may be a good hunting or target tool, but for Crisis Management I want a pump.
And finally, how mnay 870s can be bought for the price of a 391?
