The thing you need to ask your self is are you buying a 4x4 with the intention of using it off road?
We run both a td4 (the wifes) and a defender. Whilst we have taken the hippo off road and it can be surprising where it can go, the lack of a low box and ground clearance leads to problems. As stated the later TD4s are less prone to problems. If may want to think about a disco