I am in the process of pulling together a wheelset for my 2016 Santana Team Ti-700. The wheels are Spinergy PBOs and I plan to stick with the 10 speed 11-36 cassette. My question is which Santana Disc Brake Rotor should I use. I see on the Santana website they are selling a Gen 3 stainless steel 10" rotor and a Gen 4 Stainless steel and aluminum 10" rotor. The Gen 4 rotor is almost double the cost of the Gen 3. Is the Gen 4 worth the additional cost?