Additional translator note because I forgot to add it, my bad:

Mushroom Mountain (sold in English as Chocorooms) and Bamboo Shoot Village (sold in English as Chococones) are chocolate biscuit snacks sold by Japanese food company Meiji. They have also been the subject of a long running Coke vs Pepsi type debate where people debate on which of the two snacks is better. Alfort, the snack Touya mentions preferring, is another unrelated type of chocolate biscuit snack. Essentially, Touya walked into an intense Coke vs Pepsi debate saying he prefers Dr Pepper.