There are many differeces between the years you have chosen. 1997 was the last year of the 80 Series LC. Inline 6 engine, solid front axle, available factory front and rear lockers, etc.
1998 was the introduction of the 100 Series LC. V8 motor, IFS, no factory front locker (ARB locker available).
The 100 Series went through different motors and transmissions over the next few years and lost the rear factory locker in 2000.
Have a look at the FAQs for the 80 Series and the 100 Series. THis should give you more information and elp you make a better choice for your specific needs.
Spend some time reading the forums for the 80 and 100 Series LC as well.