The leaves on the XJ flex well. And if you want it to flex better there are aftermarket options. Most owners on this forum have rear lift but are happy with the rest on the rear. You could use something like a JKS crossover if you want more.
From that point it is more about which vehicle you prefer - I don't think the leaf rear is a limiting factor though.
Have driven both - I prefer my XJ
No crappy CV's in the XJ axles or tailshafts.
Much better part-time/fulltime t/case.
WAY more aftermarket parts.
Many cheaper replacement parts.
Headlights don't fall out
If you plan on building it up the XJ is a better bet, if you build up a ZJ you'll end up with an XJ transfercase, front driveshaft, possibly front diff if you want to get rid of the CV's, basically the ZJ bits will get replaced with XJ bits
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