Clearly the best chocolate brand is Kinder!
I've had Ritter Sport but they've never really tasted as good tbh. I don't mind them on occasion, but wouldn't want them more regularly.
The Lidl has this brand whose name I can't remember atm that I also get quite often simply because cheaper even if the taste is a bit less =P
Though if we're gonna talk best chocolate brand period I'm going with this:
Their milk and dark chocolate bars are pretty good too, but I've been more of a White chocolate fan for a long time now lol