It appears that you like the "cabinet" or "box" style smokers. They do offer a number of conveniences. I think I would look at:
1. WHERE the manufacturer is :- in relationship to you. If you have a maintenance or repair issue - freight can be a cost savings killer. SO - if there is a manufacturer of a unit that
you like near you - favor them. It is not THE reason to buy, but proximity counts.
2. Materials used: First - what kind of metals - outer shell stainless? What grade? Some stainless looks good initially - but will in fact rust. Ask for the grade of stainless used.
Second - insulation - what kind an how thick? Industrial rock wool is the best available currently. Sprayed in foams are not long term stable with their R-values shifting with time
and heat. A chemistry issue that would put you to sleep - but I can back up what I am saying if you ned that information. Additionally - spray foam insulation limits the temp. that
you can run the pit. It cannot take heat like rock wool. Still - there are manufacturers that use it, because they design pits to do "Low-and- Slow ONLY."
Third- Interior metal used - should always be a food contact approved grade of stainless. the racks them selves - maybe not. They are easier to remove and clean.
3. Versatility: - Is this the only pit you will have? What will you need it to do? Will it be capable of running at the temps you may want? ( i.e. chicken as one example - you need a
higher temp for skin that is palatable. If your pit can only run at say...max. temp 250F - you will have rubbery, nasty chicken skin - unless you have a second type of grill or pit to
put the chicken in and crank up the heat in order to crisp the skin to an edible state. I know you are a hog farmer - but....do you really want to limit how you can cook and what
you can cook?
4. Cost: - always a consideration. None of us are made of money after all....
5. Other cooker types to consider: - My number one answer is king be a pellet grill - based on your description of what you want from a grill. Why? You are cooking with wood. There
are a great variety of wood pellets in flavor you can select from. It is thermostatically controlled. Some can cook as low as 160-170F for a REAL smoke generating cook and taste.
Some can cook as high as 700+ degrees. Some are internally insulated ( at least the hood is ) Some can actually be controlled from your smart phone. ( I cannot express to you
the usefulness of this feature. I thought it was frivolous until I tried it...and now it gives me freedom to continue working, or sleeping or anything - and monitor meat and oven
temp., and even change the temp, or turn the grill off - from anywhere that I have internet connection!!!
So - for my money - i would strongly urge that you look at better brand pellet grills, and buy an insulating blanket ( there are several resources for these - old welders blankets are
but one of them ) and investigate the pellet grill manufacturers. We have 2 of them that are well loved and used as sponsors here on LTBBQ. They are sponsors NOT because
they were willing to write a check. They are sponsors because their products present a great advantage or value in a marketplace of some highly variable quality of products.
Hope this helps!