Would Wave lightening 6 or 7 in Mizuno volleyball shoes be best for a setter in the volleyball match?

I am 13 years old and I am the setter at the volleyball game in my club! I am in high school, and I have been playing volleyball for last 2 years now. I was wondering what shoes would be the best for me as the match is going be indoors. My friends have advised me to buy Mizuno volleyball shoes due to its sturdy grip and fine traction! I liked them too, but I am not able to decide whether Wave lightening 6, or 7 is a better buy considering my post in the match! Can somebody please advice aptly?