Getting some fancy bluetooth headphones.

My daughter is sending me a Senheiser over ear headset.
Its supposed to support aptx support. And all the latests bluetooth codecs. How would I test or quantify the improvements in bluetooth. As in what tests would I have to run. What data to collect. Im in the process of testing as many china modules as I can. Some are really good some not so good. Right now I measure the freq response to see if its flat. If its not I measure the response curve.
I also look to see if sine wave at various freq comes thru undistorted. What other tests can one do ?. Id like to test the improvements in Aptx and Ver 5. Then make a call if its worth paying extra for these modules to use in my builds.