If anyone is watching either Man vs. Wild or Survivorman for anything other than entertainment value, then they probably deserve to die if they then head to the great outdoors to test that "advice".
Bear does his show for the money. I will easily admit that. He knows better than anyone else that his show is nothing more than a television program.
Given the choice between whom I would choose to follow, though, I would choose a former SAS operator every single time.
Aside from CAG, SAS has the most strenous selection process in the world.