Which of the three research institutes of China Telecom is better?

China Telecom Research Institute. China Telecom has three research institutes, namely China Telecom Research Institute, China Telecom Group Research Institute and China Telecom Group Guangdong Research Institute. China Telecom Research Institute is the main body of the scientific and technological innovation system of China Telecom Group Company, which is responsible for basic and forward-looking technical research, applied research, research and verification of key core technologies, decision support and application innovation oriented to enterprise strategy and technology direction.