I have more 16's than anything. Yes, it is not practical as far as commercial ammo goes, but then not a whole lot about our chosen obsession is practical.
A nice 16 is usually cheaper than a similar grade and model 20, but a tad more than a 12, at least that's been my experience whether it's a double or a classic pump.
I agree with this. Although the 12s still outnumber the 16s in my safe, it's not been for lack of trying.
And most importantly, I don't do this stuff for practical purposes. None of it. Not the guns, not the dogs, not the hunting property or the long distance trips. If you want practical, I would advise looking elsewhere.