If you are going off-road, taking part in your local land rover clubs TYRO events etc, then you get an advantage 'not' having anti-roll bars, but if you are mainly on-road then they are an advantage.
Here's a load of waffle an intro into a TYRO...
I have recently changed the chassis(Richards)on my defender 300tdi the issue I have is if I go over very rough terrain at a angle the rear coil spring pops out at the top from the holder. I am using the same springs and shock absorbers that were...