VW made a 4-wheeled Aptera competitor/XL1 successor concept car ("Mission Efficiency")
(www.volkswagen-newsroom.com)
Well the Aptera might also be more efficient to drive on it's own merits once it's for sale, but it was more a comment that the VW is throwing away all the solar input unless its being driven, while the Aptera can charge with it.
So if you wanted to compare the two, it isn't fair to exclude what the Aptera can gain, that the VW is throwing away.