I have a cookshack and BIL has a
Masterbuilt so I have had experience with both and we have talked extensively about the differences. You have to way the options and decide what works best for you. I will outline a few of the differences that I have noted.
Keep in mind that this is my opinion based on my experience with both and that opinions will vary greatly.
The pros of the
Masterbuilt are the size (lots of room) and price.
The cons are build quality, customer service, hot spot (easily fixed with a minor mod) and the necessity to contiually add wood chips every couple of hours
The pros of the Cookshack are build quality, customer service and the ability to load 3-4 oz's of wood chunks and cook and entire brisket or pork butt without adding wood or tending to it.
The cons are the size and the cost is subtantially higher. I have never not had enough room to cook what I want but it does take some planning, timing, and sometimes using every square inch of the inside.
Both have provided some excellent Q so really it just matters what is important to you and what you are willing to deal with.
I also looked at (have no experience with) the Bradley and the Traeger but the use of proprietary wood pucks and/or chips turned me against these units. I like being able to go to the local store to get the wood I need.