This is a nice little machine for a desktop/nas/server, but I don't see how that can compete against the Pi in an embedded context. Input is 12V, not an ideal

This is a nice little machine for a desktop/nas/server, but I don't see how that can compete against the Pi in an embedded context. Input is 12V, not an ideal votlage to provide from a small battery. Form factor is way bigger. How is the idle wattage ?