Discoveries and Land Rover in general except the defender do not really work well with huge tires. The engines aren't powerful enough and the axles are weak. On the discos the arches are also very small. I would bet you would get better performance out of a smaller tire on a disco because the suspension will be able to work properly withoyught being limited by the tires contacting the body.
Of course, just like anything with the correct knowledge, time and a lot of money 37s can be made to work great on a disco. Is all this money and effort worth it though? Well, it's up to you to decide
