If they were paying -- it's the least they could do, there's no million-dollar prize at the end -- I'd take something big, expensive, and tough... a Jason Knight blade would work. Then I'd tap out, leaving with a nice knife, and none of the ticks, tapeworms and infections the 'winners' go home with after 21 days. I don't know why anyone would subject themselves to something like that, but I am impressed with how many people make it through.
Some of the locations seem a lot tougher than others... the swamp environments are pure hell, too wet and humid for fire, water everywhere, none of it drinkable, alligators, water moccasins, flesh-eating bacteria and fungae that thrive in the perpetual damp and rot. Nope. F*** that.
After watching a couple episodes of 'Alone', I'm starting to think the northern tip of Vancouver Island might be more difficult than any of the warmer, tropical and sub-tropical climates from 'Naked and Afraid'. North America doesn't have the variety of man-killers that Africa has, but the ones we
do have are all hanging out together on Vancouver Island.
If I did intend to see it through, I'd still want a large knife, on the principle that a big knife can do small jobs, but a small knife can't do big jobs. Most of the teams who have gotten to the end have had a large blade with them -- a machete, kukri, or bowie.