Newer is better for families and towing pop-up's over mountain passes. Plan on adding ARB front locker to any 100 you buy. (read $2000)
If you're after a trail rig on 35's then you a harder decision.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM