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That’s right. It might be an easier task to just make a filament guide once a year by asking a limited number of people to rate filaments. Gauthier actually already made an awesome job with his filament directory.
Still, I think that it would be interesting to know on a monthly basis what kind of filament the hubs worldwide really use and which one is trendy.
This kind of information is mostly useful for hubs owners because if they pick the good filament, they can improve the quality of their product. The filament brand name doesn’t have to be directly visible for customers on the interface. They already have enough trouble choosing between pla, abs or pet. 
www.3d-printer-filaments.com
They always have stock and good quality filaments.
- Chris
