I think the Alnatura chain is pretty awesome. They have a great selection of vegan food and everything is organic.
This store in Heidelberg is a bit small, thus the selection is more limited than for example at Füllhorn or Fair & Quer (Wieblingen). Also, everything is a little cramped and it feels crowded very quickly.
The staff, however, is always exceptionally friendly.Pros: good assortment, very friendly
Cons: small and cramped