Capacitor or lithium-ion battery?

Is capacitor better than lithium-ion battery? Or is there basically no differences between them?
Capacitors store very little power, only enough to save the current video files and shut the camera down.

The advantage of capacitors is that they can withstand higher temperatures than lithium batteries. Lithium batteries in dashcams tend to die after 1 or 2 years, some only a few months. Lifespan of capacitors is unknown, not enough have died yet to know!
 
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