Honestly I can't really speak to the engine. I've only used the headset at a friend's place for a few minutes to watch a short video. Since it was uncomfortable I didn't bother listening critically to it as I had no intention of getting it. And since the sound processor is permanently part of the cable I didn't even think about it as an option. If I were to guess, I'd say the app is possibly better since it's been released more recently, but that's no guarantee of the quality of course. But since 2009 sound processing has improved. I personally prefer Dolby and THX processing to the Razer software.
