The supercaps provide a huge enhancement in longevity, since the maximum current draw from the battery is lower. This can even mean a difference in manufacturing for the battery in some cases, as there are design tradeoffs between peak current draw and lifetime.
It's also potentially lower weight and lower cost, since you won't need as large of a battery (EDLCs aren't cheap though, so there is a limit).
The supercaps provide a huge enhancement in longevity, since the maximum current draw from the battery is lower. This can even mean a difference in manufacturing for the battery in some cases, as there are design tradeoffs between peak current draw and lifetime.
It's also potentially lower weight and lower cost, since you won't need as large of a battery (EDLCs aren't cheap though, so there is a limit).