Not only the racquet will you need to consider, you will also need to think about the string you will be using. On the racquets, I have yet to try AT500, but my Arc10 is doing pretty good.
If you can just look at Isometric Series' description, it will tell you. But to minimize your work, VF is VARI-Frame. VARI-Frame - Aerodynamic contouring of the top of the frame minimizes air resistance. This construction tapers into the Box Shape for high stability, low-torque performance and more accuracy. Source: www.yonex.com