While 870s are my pick, I've been fortunate in that I've shot a variety of shotguns in Practical/Tactical COFs. They include....
Winchester 97s, 12s, 1200s and 1300s.
Ithaca 37s in the Deerslayer variant. R/S, full choke, 20" barrel.
Mossberg 500s.
Remington 1100s.
S&W 3000s.
A 10 gauge sawed off Greener.
A homemade Lupara, based on the Savage/Stevens double.
High Standard Bullpup.
I may have missed a few.
All of them worked, though the 1200s and 3000s had problems when dirty. The HS was a POC, but it would probably pass the 200 rounds test if cleaned meticulously and with a little luck.
I believe I shoot the 870s best, but the difference is based on familiarity. Given time and ammo enow, I'd be about as effective with most of the others on this list.
It ain't the arrow, it's the Injun...