My children are grown and two of the three live out of state. We don't do much entertaining (although now that I have my new WSM that may change
). I gave careful thought to which cooker I should get. The initial cost had little to do with it ($100.00 difference is pretty dern small over the long haul). I ended up with the 18.5" as I thought it would be much more efficient for the cooks that I will be making. It will use considerably less charcoal and has plenty of capacity for us. I have only done a couple of cooks but that last was three racks of baby back ribs. I cut them in half so they would cook evenly in a rib rack (no burnt ends on my ribs). It worked perfectly. If I need or want more ribs at a time, I'll just do another three racks on the second grate. When doing Boston Butts for pulled pork, I can do several at a time with my 18.5. I am pretty dern happy with my choice.
If I were cooking for large groups, of course, I would go with the 22.5 but under my particular circumstances, the 18.5" is more than enough. I think some times, we tend to always think "Bigger is Better" (that can apply to me, too
) but Bigger is not always better...
I suggest that you buy for what most of your cooks will need, not the occasional one. I reasoned that my 22.5" OTG will turn out fabulous pulled pork or ribs, also. So, I have that for a back up should it be needed...
Just a thought or two...
FWIW
Dale53