The whole topic of this thread is virtual surround for stereo headphones, and headphones that work well with that audio processing. Rather than retype an explanation again (already have 100s of times in the past), I'll point out that Mad explained it in the first post of this guide thread, and that I explained it in more detail in my "If I knew then..." thread linked in my signature.
We get the same questions often about comparing those processors you mentioned, so I'm making a video comparing them and their setups, which I will post after I get my Mixamp returned around the 23rd.
I'd like to thank you in advance, on behalf of everyone, for taking the time to do that video. I am sure many of us who have no knowledge on audio will benefit from that video the most. If I may, please do not forget to also compare how good the mic works on those devices, as I've read that the new MixAmp pro 2013 combines the chat with the audio, so the result is worse audio and chat strength (maybe that was solved with firmware updates idk, I guess you will find out ). Also, I finish my finals on the 25th and I have 15 days of vacation, so I'll be sure to watch that video and make an informed purchase decision .