Well, ok. I have both.
Get the medium if you want to do a full styrofoam pack of wings, legs, or thighs. The Vortex is a supreme chicken part cooker. Fill it up with all lit, put the chicken around it, wait 25 minutes...done. You don't have to turn the chicken, I think that the bottoms actually cook faster. The medium just does a better job on the 22. And pretty good on the 26.
The small is just a little underpowered for the 22. Chicken does come out ok, but you don't get the same circulation and armhair removing heat as the medium.
I don't care about the charcoal usage. It takes about 3/4 of a chimney to fill - and I revel in the heat and air circulation that the Vortex produces.
Safety tip: Don't reach over the Vortex. Walk around to the other side.