you'll probably get as many opinions on this as people who respond.

Basically, the question you ask is too open. it covers everything from a landrover 90 to a 19ton truck. A Ural truck will have greater ground clearance and wading ability than a landrover, but do you really need all it's shortcomings such as fuel consumption and physical size?

What suits one persons situation won't suit anothers. It depends on what type of tracks you intend driving, how many people, for how long and carrying how much gear. Do you want to sleep in the vehicle or on the vehicle etc etc etc.

You will also probably get a lot of conflicting arguments depending on the brand loyalty of the respondents (usually Toyota vs Landrover)

In broad terms, short of a tractor, a unimog is probably the most competent off roader out there. There are a variety of models to choose from but size, mechanical complexity, parts availability and fuel consumption are downsides.

Of the smaller class of more standard 4x4s most arguments come down to Toyota vs Landrover vs jeep. of those I would say the landrover 90 is the most capable off roader straight out of the box. However, it lacks carrying capacity and short wheelbase vehicles like that (and the jeep) can be 'entertaining' at speed on corrugations. Do you really need that level of off road ability on the type of tracks you will be driving? Certainly in the UK Landrover also have the best supply of aftermarket bits and bobs (same probably for jeep in America, although Toyota have a good following there)and, certainly pre td5 are also easier to work on. Offset against that are concerns about reliability and build quality where Toyota leave landrover a long way behind. As the saying goes, 'if you want to go on an expedition, take a landrover, if you want to come back again take a Toyota!'.

There are a range of larger off road trucks from Ford etc which would potentially give a compromise between the two extremes. where you are based there are a multitude of good options.

My advice would be to read a bit more around the subject and decide the general type of vehicle you would need. For example, if your going rock crawling that demands a very different type of vehicle to if you want to go on an expedition through the Americas. Then ask more specific questions. Otherwise it's a bit like me saying 'I'd like a motorbike, which one is best?'!