When choosing a CGM (Continuous Glucose Monitoring) system, several factors should be considered. Look for accuracy in glucose readings, as well as the reliability of the system. Consider the ease of use, including sensor insertion and calibration processes. Compatibility with other devices, such as insulin pumps or smartphones, can enhance convenience. Evaluate the availability of data and reports, as well as the connectivity options for sharing information with healthcare providers. Cost, including sensors and transmitters, and insurance coverage should also be considered. Lastly, it's important to review user reviews and consult with healthcare professionals to make an informed decision that suits individual needs.