Really you'd need to factor in what you are going to do with it (on
road daily car, off-road fun toy, or a mostly on-road sometimes
off-road sometimes daily car), and of course your price bracket!  Plus
of course whether you tow much, or want a very quiet car.  Finally of
course, which landrover, freelander, defender, discovery etc..

The 300TDi is a bit gutless compared to the others unless you increase
the intercooler size, but it seems to be the most reliable engine when
it comes to off-road use as it doesn't care about water.  300TDi
engined machines are likely to be the cheapest too.