Wuhan Zhongke Han Wei, Nantong Youlian and Nantong Ounengda, if the ultrasonic detectors of these three companies are purchased in Hangzhou, what are their advantages and disadvantages? Please describ

Wuhan Zhongke Han Wei, Nantong Youlian and Nantong Ounengda, if the ultrasonic detectors of these three companies are purchased in Hangzhou, what are their advantages and disadvantages? Please describe it in detail for me. Wuhan Zhongke is a subsidiary of Chinese Academy of Sciences, with better performance, better after-sales service reputation and higher price. Youlian is a private enterprise with acceptable products and flexible business. As for ONTEDA, it can't be compared with the first two, and the industry doesn't know much about it. You can learn more about it. The above are personal opinions and are for reference only.