I'm not the most clued up on techy details on them all, but I've been (un?)lucky enough to drive all three over the last year after our Landie got chorred last summer.
The Landie Defender had the pulling power to tow anything we wanted without breaking a sweat. It was second to none with mud tyres in the snow and didn't slide about unless I told it to. It did though have no heating, no blowers and was noisy as hell. It was sturdy as it was heavy. It drained fuel but it took punishment being driven at speed over massively uneven ground. The occasional knock in the yard would result in merely a dent and no damage to anything more than cosmetics. If you have difficulty getting in or out high vehicles, this could be a falling point as it is fairly high up. More so than the others by miles. The ranger is just like getting into my focus however.
The Toyota Hilux would be what I would have if I had loadsamoney. Like I said earlier, it drives like a car. It wasn't too bad on fuel actually, better than the Landie but not as good as the Ranger. It had decent pull behind it and wasn't too bad at towing although with a full log load in the trailer, you noticed the difference quite considerably. It was a proper quiet and smooth drive. All the posh bits worked, e.g. heaters and electric windows. In the snow, with all-terrain tyres, it was pretty good. It slid around a bit more than the landie. I actually fully lost control for the first and only time when driving overconfidently at the beginning of the snow in December or November or whenever it bothered snowing. I turned off a main road onto a narrow lane with the sole intention of testing out its limits in snow. I wasn't aware I was "ragging it" and to be honest, I'm completely surprised the back end slid out on a gentle bend at quite a low speed, very nearly sending myself into a ditch. From that moment I realised it wasn't anything like the landie so treated it as such. I grew used to it though, driving it the 60mile round trip to and fro work, across solid ice and snow. I found myself overtaken by other people quite regularly but I'd been shown how easy it is to lose control, despite being in such a beast, in 4wd. Oh yeah, and a colleague drove it fairly fast over an uneven field and the front bumper came off, reminding him that it is very low to the ground compared to the Landie.
Driven the ranger with road tyres for a few weeks now. It is pretty nice. Heater is good, stereo has decent speakers for a work vehicle (I can blare out techno at a reasonable level with hardly any distortion). Driven 90 miles with trailer on back today, even empty I could feel the weight behind me. Driven on fairly crap roads and on tracks around site. Obviously having road tyres you lose an element of grip but driven sensibly it is fine. I wouldn't take it into the fields though. This could be a problem when we come to feeding our animals.
Hope that helps!