Outside the us, the defender is the clean winner. In the US, North American spec defenders are very expensive (especially for a 110) and do not have the great 200tdi or 300tdi engines (they have thirsty V8s). Mechanically, a discovery 1 or range rover classic is basically the same as a North American spec defender, but the body is heavier, more prone to structural rust and does not have the excellent Salisbury rear axle of the 110.
The good news is that 25 plus year old defenders are legally importable. The bad news is that the dot has cracked down and they have to be original to import which compounded by the fact that none will legally have a tdi and most all are RHD and the vast majority are rusted out crap that needs a fair bit of work leaves any decent defender am expensive proposition.