I would have to ask just how off road are you talking about?
I had a ’84 CJ7 that did quite well, except it continued to have rear axle problems.
I have a ’76 Chevy Short Bed pick up that did very well, but she is my plow truck now.
My current vehicle is an ’06 Pathfinder, and while I know it’s not really an off road vehicle, it does pretty well.
My Wife has a ’03 Grand Jeep, and while it does well ‘off road’ it has had a lot of mechanical issues.
For a box stock off road vehicle, I have heard that the new Toyota FJ is pretty good. The Jeep is of course smaller and more nimble.
Can’t address the question of Jeeps reliability for the new ones, but if I was in an older one, I would bring lot’s of tools.
(It aggravates me that the decent 4x4’s of old are being turned into AWD mini-vans and cross-overs that have no business being off road)