Alaska: The Last Frontier.
Dual Survivor is interesting, but they obviously have a team of camera men/support staff in tow. Cody and Joe are fun to watch. Survivorman may not be as exciting, but Les Stroud is no doubt out there by himself and it's definitely not scripted.
Tried watching Duck Dynasty a few times but couldn't get into it; too much 'Hyuck-yuk' telegraphed humor, and it just seems waaaay too contrived. I'll just watch The Beverly Hillbillies if I want to see a funnier version of rich rednecks.