‘91-‘92 have smaller front disc brakes, no ABS, semi-float rear axle with drum brakes, and 15” wheels.
Some say the ‘93/‘94 are the best year, OBD1, best engine, best tranny... etc....
93 and up has a good following for aftermarket stuff or OEM.
‘94 was available with lockers.
Also keep in mind that the 93 and 94 model years had the slightly shorter birfields which makes them easier to find Aisin hubs for if you choose to convert to part time 4x4. And they also have the better looking front grill without the space cowboy emblem.
93-‘97 have larger front disc brakes, full float rear axle with discs, ABS, and 16” wheels. '93 & '94 were available without the ABS option, in which case the rear axle will be semi-floating. This is why you should exercise caution when you see Craigslist posts that say, "has the center diff lock option!" If it came from the factory that way, it means it's *missing* the ABS option.
‘95- ‘97 have airbags, full float rear diff, OBD-II, and you can still get engine wire harnesses and o2 sensors.
95+ has a mass air flow sensor, not a MAF meter, so you don’t have to worry about the MAF meter failing.
3FE parts are starting to become scarce. Most of the heater hoses on the 3FE are discontinued

The 3FEhad such a limited run, there is really no aftermarket support for anything.
The 3FE is slow, dead reliable, super simple, easy to work on, and relatively impervious to neglect. It is pushrod in-block cam, direct drive (no timing belt or chains). Bullet proof. Non-electronic A440F transmission, no ABS system, no airbags, no PHH and fewer head gasket issues as it has an iron block and iron head.
The 3FE also has a lower torque apex than the 1FZ. Put 33’s on and you’ll hit third gear before you hit 20 mph, lots of low end control off road!
They are slow on the highway, slower on steep highway grades, and happiest cruising in the mid 60 MPHs, which was the speed limit for which they were designed back then.
It's reasonable to expect deferred and ongoing preventative maintenance. Somewhere on this forum is an excellent 3FE tune-up checklist--this is must-do for the 3FE. Sunroofs leak. Cracked dashboards and front seat bottom cushion sidings are common. Also expect to replace rubber things, especially suspension bushings and belts, but also door seals, window runs, etc.