What do I prefer--hmm I bet you can guess.
I guess it depends on what you will do with it. I like the WB of a ZJ better, I like the v8, I like the novelty and the lines of the ZJ better. I like the softer ride of the coils front/rear better. However, the XJ has a better axles/t-case most of the time (HP30 front, 44 rears), is cheaper, lighter, etc. But everyone has XJ's these days.
If you are going to hack it all up and swap axles and get generally nasty with it, then it doesn't really matter what unibody vehicle you get. It's not like you can't push an XJ out to 107 and link up the rear....
There are positives and negatives to both. I deffinatly don't like the size of my hood, the unibody, or how front heavy my rig is. A normal ZJ doesn't have the weight bias issues that I have. I would love to see somone lay into a Durango or a newer WJ with a sawzall, a vengence, and a vision. I know there have been a couple wrecked WJ's out there that went for around 1500 comlete with the super-sexy 4.7 v8 and such.
Having a frame just makes things so much easier. Will you be driving it or trailering it?
Cody