I figured I would post why I went with the 18.5 over the 22.5.
First off size, my wife can only handle so many grills/smokers. Now that I have the trifecta(Kettle, WSM, Geniess) I'm pretty good.
Second, weight the 18.5 is much easier to move, IMHO.
Thirdly, cost. You can find 18.5 on Craigs...