Another licensed pilot here (but not a skydiver).
I would have attempted a controlled crash over gentle mountainous terrain like this. You want to dump the aircraft's kinetic energy rapidly but not suddenly -- gliding into the side of a cliff will kill you, but keeping the airplane pointed forward while shearing off the wheels and crumpling the nose is fine. It looked like there were several areas where this would have been relatively safe to attempt. You don't need a nice flat field for a survivable crash.
After you're on the ground, you also need to be able to survive (possibly for days), and then be visible enough to be found and rescued. Staying with the aircraft is usually considered the safer approach, both for visibility as well as the emergency gear that you're supposed to be carrying in the back.
The only terrain where I'd seriously consider bailing out (assuming I had a parachute) is dense forest with no clearings. Surviving a crash like this is incredibly difficult -- you hit a redwood, shear off your wings, and then plummet 250 ft to your death. It'll be hard to spot the wreckage of a small plane from above. Even with a parachute, there's a serious risk of getting stuck in a tree (or impaled by branches). There are basically no good options here.
In short, mountains aren't so bad. But be super careful flying over forests. If this video was a stunt, there's a reason why he decided to stage it over mountains rather than a forest.