The dogo argentino will not do well in extreme cold.
Pyrenees are flock guardians while border collies are herding dogs. Big difference. One was bred to protect the herd from predators (wolves etc) the other to help move them around.
The traits that make malinois suited for service also make them horrible pets. They NEED an intellectually and physically challenging job. If you don't provide it they will turn all that energy and intelligence to destructive pursuits.
Maybe I'm missing the point of your post... I never said dogo argentinos for extreme cold or sled dog (although they would do better than most other multi-purpose dogs, considering the number of locations that experience extreme cold it's not that big of a factor). Nor did I suggest pyrenees and border collies are the same, the choice would be dependent upon one's situation (I also forgot to mention curs/catahoulas, think they're up there in that category).
And we aren't talking about pets, we're talking about the 'ultimate survival dog' which basically precludes pets. 'Ultimate survival dog' means that you would want a dog that excels in several categories relevant to survival, and is near the top in most other categories, while being at least satisfactory in one or two of the lowest skills for that dog breed. And to be honest, very few breeds meet that ideal, very few can protect themselves and you, help find food for you and themselves, be trainable to learn many skills in different areas, adaptable to the environment, aware, intelligent, and stable tempered. I should have mentioned that such a dog is unsuitable for 99.9% of the population, and that very few people have ever even seen a serious protection dog, but most people today don't like being warned. Nevertheless, survival with a focus on personal protection demands such a dog as the ideal, just as one's own skills demand a level approaching that of Mors Kochanski. If one were to go that route they should also go through all the years of training.
That does not make them horrible pets, rather it means that most people are simply unsuited to serious skills, responsibility, and training of high-drive dogs; nor do they have the tempered nature of leadership that such dogs demand. So it is quite the opposite of what you say, pets, and the masters who (fail to) train them, make horrible working/survival dogs.
It is a mistake to assume that the average dog, especially pets, will offer any real protection, that a visible deterrent will be enough in full survival, or that certain breeds will compensate for your own lack of training. As such, this should probably be in the 'skills' section rather than 'gear'.