First of all... I tried all of them and they taste horrible...
Second... Zotter chocoloate isn't chocolate by definition.
It says "Helle Bergmilchschokolade". It even says it twice in the first sentence of the backside of it. "Helle" and "Milch". A chocolate that's chocolate by definition isn't "bright". A chocolate that's by definition chocolate also isn't a "milk chocolate". That's a marketing trick, because milk chocolate legally isn't allowed call itself chocolate. The only thing worse than milk chocolate, which often taste way too sweet, is "kakaohaltige Fettglasur" (cocoa comound coating).