Compare charge time and battery runtime
Look for the test setting before comparing two published runtime numbers.
Compare high with high and low with low
CalExotics lists the Aura Ripple and Flutter at 45 minutes on high and 90 minutes on low. A different model may publish a single figure without a setting, which makes a direct comparison uncertain.
Check which cable comes with the product
Some devices list a magnetic USB cable, while others only specify USB. The power supply and the connector at the device are separate details. Match any replacement cable to the exact model.