Kind of a loaded question.
If I was in a very bad situation, and I absolutely could not find my way out, had no clue where I was, or was injured, I would follow the Les Stroud model. Save energy, sit tight, and make myself as visible as possible.
If I knew where I was, which route I needed to take, and about how long it was going to take me to get there, and had something waiting on the other end that would ensure my survival, I would follow the Bear Grylls model. Bail off cliffs, slide down waterfalls, jump over lava, etc. Which I have done (except for the lava part).
That being said, Bear is a moron. The name of his show should be "How to Get Yourself killed, with Bear Grylls." Any novice or wannabe outdoorsman who trys to follow his advice is in for a world of hurt.