What's most important to YOU. Ease of use, taste of the meat, convenience, or portability?
For me in order of importance was taste of meat, ease of use, portability, then convenience.
Since I was most concerned with how my meat taste I quickly ruled out propane or electric smokers.
Then I wanted something fairly easy to use so I ruled out reverse flow, or smokers with side mounted fire boxes.
Then portability. Since I like to camp, fish, take my smoker to the beach I needed something that could be broken down and transferred easily so I had to remove the larger box smokers since they didn't break down and couldn't be transferred easily.
Lastly I wanted something fairly convenient and simply to use so I wouldn't have to spend 12 hours chained to my smoker just to get good brisket.
So after all that I ended up with the WSM 18.5 with an Pro-Q stacker add-on and a Stoker power draft controller.
It uses coals and wood so the taste is great.
It's easy to setup and use.
It breaks down into multiple sections and fits nicely in a box about 2' tall.
With the add on Pro-Q section I now have 3 18" sections for a total of 54" of cooking space. Where the 22.5 WSM only has 44" of cooking space. I also decided against the 22.5 because although longer I can remove my Pro-Q section when I don't need it and it burns a LOT less fuel than the 22.5". With the extra section on I've done as much as 6 10lb pork butts or 18 slabs of ribs at once.
However my favorite part of the setup is the Stoker Power Draft System. Once you get your coals on all you do is program the temp you want to keep it at and the fan will turn on an off accordingly adjusting the air flow. It can run for up to 12 hours on 2 loads of coals. I was hosting a get together a month or so ago after a diving trip and I got up about 1 hour before we left got the smoker ready and put on a large pork butt. Then I took off to the beach to go diving for about 6 hours. I was telling my buddies that they where in for some good BBQ when we get back and told them I've been cooking it the entire time and they couldn't believe me. Just as we where packing up our gear I get an e-mail on my cell phone saying the pork butt was almost done. 15 min later I pull the meat let it rest while we have a few beers then pull and serve. It came out perfectly and the best part is all I had to do was spend a little time prepping and lighting the coals and the stoker did the rest. Talk about convenient. My buddy was so impressed he ordered the same setup the next day!