This is a fun thread, so I'll weigh in here. When I purchased my 97 LE 4x4 in 1998, the Xterra was barely a gleam in Nissan's eye. The Xterra wasn't even introduced until 2001. In 1998, the only alternative I was willing to consider was the 4Runner, but it was too expensive.
When I bought my Pathy, I actually wasn't even into 4-wheeling. I was into watersports, and I figured 4WD might come in handy for the occasional slippery launch ramp. It wasn't until I actually went off-roading for the first time that I got hooked. I started building my R50 into a "serious" 4-wheeler. By "serious" I mean, I actually drive it off-road, over boulders, often getting 2 wheels in the air. My R50 is not a mall crawler or poseur expedition rig.
In the early days, there was almost ZERO aftermarket support for the R50, so I had to find creative ways to build up what I owned. I started with 31" tires, then had a local spring fabricator custom-make 2" lift springs for me. I did a little trial-and-error shopping for Rancho RS9000 shocks that worked with the lift. Soon afterward, I scored a TJM T-15 bull bar and added a Warn winch to it. I added a Safari-style roof rack and found a local fabricator to build rock sliders for me. This was all prior to 2001 (again, BEFORE the Xterra was introduced).
By the time the Xterra PRO4X models were even available, my Pathy was paid off and was mostly fully built. The only things I've added since the PRO4X became available on new Xterras (circa 2011) are: LED lights, which replaced the IPF driving lights I had before, and a 4" subframe drop to add to my existing 2" lift and a matching 6" rear spring/shock combo.
I suppose if anyone interested in getting off the beaten path and actually fully using 4WD, a decent pre-owned platform to start with might be the Xterra PRO4X, since it's newer, larger, better equipped, and more powerful than even the youngest R50. It'll also be more expensive, but that's what it takes to drive something at least 7 years newer. I doubt that many R50 owners chose the inexpensive, reliable platform to build into a "serious" off-roader with resale in mind.
Starting an off-road build with the R50 platform is certainly more complicated than building a PRO4X, but it is a completely unfounded statement to say that the R50 cannot be built to be as competent as a PRO4X.