They use bitdefenders threat network. They also dont publish the Chinese Version outside China, but have a special Client which is regularly tested by the same Institutions which have given Windows defender a decent score in case it calms you down.

The English Version has only a small amount of the Features the Chinese Version has and the ui is worse, but it still out played almost all of the competition in av comparatives Tests.

The ransomware detection is one of the Best ive seen so far. If I remember correctly it got All of the 30+ Samples and only 2 false positives while WD maybe protects you from 3 of the less advanced ones, like wannacry.