The most important factor for daily use. Models that fit securely and comfortably for 2+ hours earn higher long-term satisfaction. Consider ear tip material, weight distribution, and whether the design accommodates glasses or different ear shapes.

Driver size and frequency response tell part of the story, but tuning curve determines whether vocals sound natural and bass feels punchy. Check whether the model supports EQ adjustment via companion app for personalized tuning.

Real-world battery life is typically 70-80% of manufacturer claims at moderate volume. Check whether the case supports wireless charging and how fast the earbuds recharge from the case.

Newer Bluetooth versions improve stability and range. Multipoint connection lets you switch between phone and laptop without re-pairing. Verify codec support (AAC, aptX, LDAC) matches your device.