check the air suspension for leaks,condition of airbags.check that all functions of the heater works,ie the air distribution.check for head gasket probs or oil in the water.check everything that is electrically operated.check to see if you get both keys with it,and that the central locking works with the key fob.
i would'nt say that a RR is better than a disco there is a lot more to go wrong on RR im even starting to think i should of had a disco or even a deffender :doh:
ok,check everything else i suggested then.i don't have an opinion on a disco cos i have never owned one.personally i do not like them but that is my own opinion though.