I have ZC and Special and they are very different, ZC is a little bit slower it means it can generate more spin and has more feeling. While Special is a little bit stronger and almost no vibration which can generate more speed and low arc trajectory. If you will ask me which one is better, my answer is it is always depend to your preference. For me I both like it and I both use it depending on my opponent 😊 it is easy to adjust anyway.