Thanks for all the support for JCR in this thread.
I think the strongest steering possible for a rig that gets driven a lot on the street is running the WJ or Terraflex knuckles with the TRE's or Heims of your choice and some DOM tube.
People ask me a lot what is the best setup IMHO, and I always say WJ knuckles and brakes, steering from us with Chevy TRE's.
For some, the parts availability, cost, or fabrication for the WJ setup is prohibitive. The Terra knuckle makes sense, but you don't get the braking benefit.
As far as our products go, I think the OTK (over the knuckle) kit is a good compromise. You get a flatter drag link, and that means a more positive steering feel (and less tie rod roll) plus you get the steering out of the rocks. The downside is obviously the fabrication necessary.
The UTK (under the knuckle) kit is easy to install, adds some serious beef, but has the issue that all inverted T systems do: the drag link tries to roll the tie rod before it turns the wheels. This issue is increased on the XJ because the steering box is comparatively higher than on the SWB Jeeps. We include the poly spacer for this issue, based on what Jeep had done years ago for the same issue on the FSJ's. I don't know if I would call it a band-aid, but it's the compromise for the steering setup. Some people have issue with on road feel of this setup, some do not.
What's the answer for you? I don't know. You will have to figure out what your willing to spend, how much work your willing to do (or pay to have done), and finally how do you use your Jeep?
Strength wise I'll put our UTK kit against anything. For a little more time or money, there are better options (OTK, WJ setup) if you don't get to the trail as much as you like. If anyone has any questions, feel free and call me. I'm also pretty versed in the WJ knuckle swap as well. One thing I won't do is try to sell our steering if it's not right for you. We would rather lose a sale than deal with a disappointed or angry customer.
As for me, I run the WJ setup with custom steering on my wifes XJ. It is her DD, and most of the wheeling it sees is on access roads with our camping gear. So I get by with smaller factory taper TRE's and 1.125 tube. I am super picky about my steering, and do not have any handling problems with this setup.
Sorry for the long post