Having just been through this myself, except with a Jeep Cherokee, let me share my thoughts.
1, First do you want a fully integrated vehicle mounted system like the SMI Stay and Play Duo or Road Master Invisibrake which mounts remotely (under the hood, or under the seat) OR do you want a unit that you have to remove from the foot well each time you want to drive the Jeep. There are advantages both ways depending on how you plan to use the TOAD.
2, Some of the foot well units are easier to set up than others, the 4 big name units come from Ready Brake, RVI, Road Master, and Blue Ox. All require running a wire to the brake away switch mounted at the front bumper, some require more than that. Such as the Roadmaster Ready Brake, which is the unit I ended up buying which has a deck of cards sized transmitter box which must be mounted and hard wired in the TOAD which also acts as a common plug point for the brake light switch, and brake away switch leaving only 1 USB like wire to plug into the main removable unit. Some other units require multiple wires to be plugged into the removable unit.
I don't have any particular loyalty to the Ready Brake, it is just the one I found a deal on, I bought it used for $400 on ebay with all the accessories (remote in cab monitor, new brake away switch, transmitter, etc.), which I don't think is too bad since it is only 1 year old, and sells for $1,200 new online. If I were to buy new I might be inclined to buy the RVI Brake 3 due to its more compact size, though more care must be taken in setup to make sure it does not ride the brake pedal, something that the Ready Brake will alert you to since it actually has a brake switch feedback ( I don't think any of the others have this feature).
If I were to go with an integrated permanently mounted system it would be the Stay and Play Duo as there are lots of satisfied owners out there. My personal reason for going with a drop in unit is that the car is my wife's daily driver car, and will only be used in TOAD service when we are on vacation, last year her daily driver was totalled due to a teenager running a traffic light and I would prefer to not have to deal with fighting an insurance company over the cost of a braking system if that were to happen again. Also I travel solo about 1/3 of the time and may end up buying a cheap TOAD to use on those trips, having the Ready Brake makes it somewhat easy to transfer between cars, only needing a 2nd vehicle kit with another brake away switch, transmitter unit, etc.