Trust me, you can do a lot with four extra inches.
Thats what she said... :becky:
I own the 18.5 and I agree with almost everything already mentioned. Ribs can be a slight pain if you want to keep them untrimmed. Also the hot spots around the perimeter will have the tendency to overcook the edges when I do two racks of untrimmed spares.
As previously mentioned you can make maximum use out of the smoker by rolling the ribs and just being creative. Last weekend I smoked three untrimmed racks of spares on the top rack and four chicken halves on the bottom rack (about 19lbs of meat). The only pain would be if you had food on multiple racks that you want to baste. The other downside to the 18.5 is when I smoke a full packer I have to look for smaller packers (last one I bought was about 12lbs untrimmed), I slightly trimmed it in hopes of helping it fit and when it finally went on the smoker I had to scrunch the brisket like an accordion a little just to close the lid. :shock:
I am a college student with NO coin so I was forced into the 18.5 due to cost. IF I had a decent income I would but the 22.5 and fabricate a smaller ring for the charcoal if I found myself using more fuel than I thought was necessary. The biggest advantage to the 18.5 is the smaller size allows you to take it everywhere without a truck.
I don't know ANYONE who bought the 22 and wish they went smaller, and you all know thats not true the other way around