I haven't driven an MG or Timberline van, but we just got our van converted with a 6" UJOR kit. I will say it drives/handles awesome on the road. Not as good as a car or our 2020 AWD transit, but pretty damn close. The reduced turning radius is noticeable but not a deal breaker. I also notice that it takes more revolutions of the steering wheel to turn the same amount. Must be something to do with changing the arm length ratio between pitman arm and steering arm (whatever the part is that is connected to the hub).
I think it was in one of his YouTube videos, but I believe Chris specifically mentions how these vans spend 90% of the time on the road, so their kits are tuned to perform well on-road. Not sure how much of that is truth vs marketing, but something to consider.
Another factor that really won me over about the UJOR kit was their "crossover" steering geometry. Essentially, they bolt on a new arm (i forget the exact term) on the passenger side knuckle/hub, so the drag link passes ABOVE the leaf spring and sits fairly close to horizontal in its resting state. The track bar sits parallel to the drag link, so it is horizontal as well. This means that, from its resting state, any upward/downward motion of the suspension will result in the least amount of lateral force being applied against the pitman arm by the drag link. In theory this should reduce the effect of bump steer (which is a potential input that could cause death wobble?). Another thing I noticed was that I have never seen a UJOR van with steering stabilizers, whereas many of the other conversions are often seen with one, if not two stabilizers.
UJOR's youtube channel is pretty great. Mostly just short recaps of their builds, but once in a while they post some informative tech videos as well:
https://youtu.be/7tXKQsqt2F0
https://youtu.be/gVpRYran6e0
If you look at most of the other 4x4 conversions, you'll notice that the drag link is at a fairly steep angle and not close to horizontal at all. So any suspension input will cause more of a steering input compared to if the drag link was horizontal.
I believe Timberline offers a similar "crossover" steering kit, but only on their highest end
coilover conversions. They call it their "high steering" kit.
And of course, my final disclaimer - I know NOTHING about vehicle steering geometry. I'm just relaying my learnings/observations as I shopped around for our 4x4 conversion.