Which is the best CO2 laser between QiZhi and Coying?

QiZhi and Coying carbon dioxide laser relative to see is QiZhi better, because first of all QiZhi was founded in 2001, earlier than the Coying 2003, has a more mature experience, and secondly, QiZhi focus on advanced medical laser solutions research, has more than 100 patents, Coying has been declared and obtained only dozens of patents, in the technical level is also QiZhi more excellent! Some, so QiZhi and Co-eng carbon dioxide laser relative view is QiZhi better.