The Bradley is the only "set and forget" watt burner I know of unless you spend big bucks on a pellet pooper...hopefully one day I will own an FEC100. All of the others need to be attended to at times to add wood. Also, none of the true set and forget watt burners can use your apple wood...pucks or pellets are needed.
I have the Bradley with a PID mod and love it when I want to plug it in and forget about it. I also have two 40" MES smokers and love them but must add wood now and then...the plus with the MES is that you can add your apple wood to the MES.
I do not own (but would love) the 22"
WSM for long cooks. If you are handy and can get the parts, build a UDS which is great for long set and forget cooks. I have two of them and once the temp is stable, they can go all night and most of the next day on one load of coal and your apple wood.
I do lots of jerky now and used to do a TON of salmon when I lived in Western Washington. I always do jerky, sausage, and fish on a watt burner so I can keep a consistent low temp needed for these meats.
I don't own and have not used a propane smoker. However, I have heard that a coffee can with a big round of your favorite wood will smoke for a very long time once the temp settles in. That may be your best bet to set and forget and also use your apple wood. This summer I plan to mod my old New Braunfels vertical smoker by installing a propane burner.
If you find a true set and forget watt burner that uses wood chunks, let me know!
Weigh out want is most important to you...set and forget or using your own wood...and then make a decision. Problem is, you will most likely get addicted to smoking food and want more than one smoker!
I am sure that I just made your decision tougher...sorry.