Some discussions are given to the three universal diagnostic systems in forums. They are Launch X431 DIAGUN 3, Autel DS708 and OEMscan GreenDS GDS+3. Their similarities and differences are best list as below. Manufacture: DS708 is manufactured by Autel Tech, DIAGUN 3 is one of the outstanding masterpieces of Launch X431 and OEMScan GDS+3 is made by GreenDS tech. Vehicle coverage: Autel DS708 covers more than 40 vehicles makes from US domestic, Asian and European. Diagun 3 can work on as many as 70 diesel and gasoline vehicle makes. OEMscan GreenDS GDS+3 supports specially American and Japanese vehicles. It is compatible with Benz and BMW connector, it is able to do 24V Benz truck.