Seat comfort is highly subjective. There's really no substitute to spending as much time as possible test driving the car and seeing how you like the seat.
My favorite seats have been in Fords, Volvos, Acuras, Nissans (2013+ Altima, 2015+ Murano), and Lexus (though certainly not all models of any of these).
I'd suggest rented different car models as part of the evaluation process, but your choices might be limited by your company's choice of vendor.
If the car is going to sit most of the time, I don't see much point in sinking much money into it, unless it's something you really like and will take weekend drives in, etc. Will you be off-roading, or just like the idea of a Wrangler?
Without knowing the specifics on how you'll be using it, the Wrangler doesn't seem like a good idea, as the ride can be quite bouncy and the seats are nothing special. Among Jeeps, the Cherokee has better seats (if you get leather) and a smoother ride, but long-term reliability remains to be seen. The larger Grand Cherokee rides well over fairly large bumps, but tosses a little over relatively minor road undulations. Its seats are pretty good, but not outstanding.
The Volvo XC60 might be worth a look.
The most comfortable cars tend to be large sedans. Recently I've been impressed by the overall comfort of both the 2015+ Hyundai Genesis (currently being discounted heavily) and the Dodge Charger / Chrysler 300. Both are available with all-wheel-drive.