I got tired of the pounding of the 3 1/2 inch shells out of my SBE2, and decided go the 20 route. I wanted something as lightweight as I could get it, and still shoot good. I first tried a Charles Daly pump, very light, but junk. Got an 11-87 with 26 inch barrel, worked good, but just wanted something with a shorter barrel. So, I then bought a youth model 11-87 with 21 inch barrel, put a Indian Creek choke and red dot sight on it. Nice gun, but before I got to use it, my granddaughter latched onto it. I now use an 870 youth model, Weaver shotgun scope, and an Indian Creek choke. Using the 20 has been a little different experience, as most of the really good ammo is made just in 12 guage, but I've not had any trouble killing a turkey with the 20. In the 12's I always used Winchester Supreme #5's, in the 20's I've used Hevi-Shot, Winchesters, Federals, and Remington, trying to find one that was better than the others. Haven't found it yet, as any shell in #5 seems to work.
