The RightMark Audio Analyzer suite is designed for testing quality of analog and digital paths of any audio devices, be it a sound card, an MP3 player, a consumer CD/DVD player or an acoustic set. The results are obtained by playing and recording test signals passed through the tested audio path by means of frequency analysis algorithms. The latest version of RightMark Audio Analyzer can be found here.
There isn’t any discernible difference between our two platforms today. Likely that is because they are from the same manufacturer, same audio codec and likely the same implementation of the IC. Though, what time I have had with them I haven’t heard any issues with the audio quality.