Roxann: The search function of the bboard will likely offer you non-Vandoren manufacturer strength comparisons with Vandoren.
With this info, this exercise might be like what we call on Wall Street Triads: equating two currencies (reeds brands) that don't exchange enough to have a good market to base prices on, say, Pesos (Steuer) and Australian Dollars (Gonzales), by comparing the Pesos to US Dollars (Vandoren) and US Dollars to Australian Dollars (Gonzales).