Buyers should prioritize Active Noise Cancellation (ANC) depth, typically measured in decibels (dB); a reduction of 30dB to 45dB is considered industry-leading. Additionally, verify the Bluetooth version (5.3 or higher) for stable connectivity and low latency. For audio quality, ensure support for high-definition codecs like aptX, AAC, or LDAC. Battery life is also critical; look for a minimum of 6-8 hours of continuous playback with ANC enabled, and a total of 24+ hours including the charging case.