They're simply different companies. VW is fairly broad spectrum when it comes to cars, even a Mercedes 'A' class (or a Smart for that matter) is fairly expensive compared to an entry level VW (say, an 'Up').

Tesla outperforms VW because they are riding a wave and have been very successful in maintaining their lead in BEVs. That won't last and then the likes of VW and possibly Toyota if they ever get with the times are going to eat Tesla's lunch, especially if the chief twat is going to be distracted by his new toys.