1. Super VAG K+CAN V4.6 is better for cars that support K-line protocol.
2. Super VAG K+CAN Plus 2.0 is better for cars that support CAN protocol.
3. Super VAG K+CAN Plus 2.0 support change mileage for the newer car models, while Super VAG K+CAN V4.6 support change mileage for the older car models.
4. Super VAG V4.6 just can do cars beofe 2006,it is supposed to work with old VAG cars, can not support new cars while Super VAG K+CAN Plus 2.0 just can do cars after 2007,and please note it is not suitable for Audi
5. Super VAG K+CAN Plus 2.0 supports reading more car's pin code.

You can choose the device according to you budget.