Oh man, this is definitely an open-ended discussion. Problem is that it's very subjective.
For me, when I think of the "perfect overlanding vehicle" I think diesel (for reliability/mpg), not micro but not full size, range, simplicity, among other things. Of course the best for a particular area may very well be a gas vehicle if there's not a station with diesel. Not to mention many other factors.
One to add to the list is the International Scout. I may be biased becuase I have two of them. But something to consider. Both '80 model years with the turbo diesel. They came with a stout power plant from Nissan. The gas versions would be lower on my list due to mileage, but were reliable in thier own right. The positives for the '80 model turbo diesels were many. Dana 44 axles front and rear, good mileage, good reliability, Dana 300 TCs, T19 transmissions, mechanical injection, spacious interiors (esp on traveler models with longer wheelbase), shared running gear components with many other domestic vehicles, etc. My traveler has the optional 33 gal fuel tank. That coupled with the nearly 25mpg I can eek out gives it good range.
The negatives are poorly designed sheet metal that produces rust faster than most thought possible, scarcity of parts for the Nissan power plant here in the states, and some other things that made them so unique that parts/repair weren't as easy as some other vehicles.
I'll go ahead and say that legit full size vehicles aren't on the list for me. Especially most domestic full sizes and even the new tundras. They just feel too big...but that's personal preference and isn't meant to disparage thier capabilities.
It's nothing more than a give and take. I think this goes for most vehicles mentioned here. I don't think there is a clear champion, as all could've have done one thing or another better, but I will say that some of the toyotas are about as close as you can get. Jeeps obviously have a lot going for them. Toyota just offers a wider variety of options. It's one of the reasons I just picked up a first gen tundra. It's not FULL size, has everything I want and not much of what I don't. The only ways it could be better would be a Diesel engine, but even that wouldn't be a huge leap except for maybe mileage. The 4.7 has ample power and is reliable. The Toyota reliability is a breath of fresh air compared to some vehicles like the rovers I've had. This discussion might be quite different if diesel rovers were brought here in numbers.
But neither my scout nor my tundra does everything I want. I'll keep both and use them for different type trips.
This discussion is so multi faceted its not even funny. If the parameters were tightened a bit it might be easier. There really are a ton of good options despite the fact that the US gets the short end of the stick when it comes to quintessential overland autos. Just gotta find what works. A single guy can come up with a different list than a family of five.