Filmmaker: I use hidden cameras when filming documentaries, because people behave differently when they are aware of being filmed.
Conclusion (hence)
My are more worthwhile than other documentaries such as those where people speak directly to the camera.
Evidence
My subjects remain unaware of the camera's location and therefore act naturally.
Evaluate
The conclusion is a comparative normative idea: "more worthwhile".
So our answer should either be a conditional with an outcome of → more worthwhile
or it should be comparison about which things are "more worthwhile" than other things.
The comparative difference we have to go off is that this dude's documentaries involve subjects being unaware of the camera's location and acting naturally.
Goal
We want an answer to take us from what we know about his documentaries (the subjects aren't aware of the camera's location and act naturally) to what we want to prove about his documentaries (they're more worthwhile).
Look for something like or