Which double-row key grading institution is more authoritative?

Nanjing dimethoate double-row key music center.

Nanjing Lego Double-breasted Music Center is an institution focusing on double-breasted music education in Jiangsu Province. Founded in 2009, it has made remarkable achievements in the promotion and application of electronic organ, which has promoted the electronic organ in Jiangsu Province from scratch.

The Chinese Double-row Key Examination is an examination organized by the Chinese Music Association for people of all ages, with scores ranging from 1 to 10 (10 is the highest level), and those who pass the examination can obtain certificates.