Driver material will have a lot less to do with a speaker's sound than design parameters. Why do you think you can have two speakers that use the same Vifa drivers sound so different? There are a lot of other things to take into consideration, such as cabinet construction, dispersion patterns, crossover components and design, speaker design (i.e. transmission line, acoustic suspension, etc.). In other words, don't worry about the speaker materials, just worry about the overall sound.

Hope this helps.