This is like comparing apples to oranges. We had a run of 8 Discos from 1991-2013 & loved them. The cost of ownership was way more than the T6 is costing us. That said, the D4 is the best tow vehicle I’ve ever driven, it was planted, supremely comfortable, and powerful. But we couldn’t sleep in it, cook in it etc. If I had to make the same choice again between a Landrover Defender/Disco/Range Rover etc. and the T6, it would be the T6. They are completely different beasts aimed at completely different markets. If money was no object, I’d have both.