"SBX Surround off" with TF2 as in the YT video is ok/normal during "legacy surround 1" due to OpenAL/DS3D (automatically), I am not sure if the uploader did everything right during setup. In any other game you would get stereo if you'd disable SBX. Like BF3 for instance. Just testing loudspeaker signals in the windows audio panel (5.1) is enough to notice that of course.
SBX is bassier than CMSS-3D where the bass is noticably toned down, not surprising. With the Z(xR) panel you can correct this perfectly for your taste. I wouldn't touch it for Singleplayer, I understand it for competitive gameplay.
SBX Is superior to Dolby Headphone. It trumps it in every department plus it gives legacy support which no DHP card does right. If you're on PC then SBX is the way to go. That's not 100% of the truth however:
CMSS-3D is old and outdated for modern times, it affects SQ and tonality negatively. "Tin can" is one of the best fitting terms. It gets worse the better your setup is. I am using the HD 800, the more forgiving (and funnier) Signature DJ and the PC360. The effect on the SQ is noticable on every decent headphone. SBX is much better in this regard. It's quite a difference.
CMSS-3D however has hardware acceleration that Creative is lazy to do for the Core3D since it only affects older titles. Dissapointing. Nvidia has a very nice PDF regarding GPU accelerated audio. We don't know what the future brings. I suspect with PS4 and Xbox One definitely having hardware audio some change is bound to happen on PC later.
Anyway, I suspect the X-Fi cards to be better in older titles but I want to clarify this once and for all, meaning WE should do a roundup of tests.
First we need a games list and a testing/evaluation method, like timedemos or gameplay/missions/levels that are at least decent in reproducing. I love the escape scene in MEdge with the helicopter shooting bullets behind me, over me, left, right and before me but the helicopter gunner is not reliable in his shooting. You need a few runs to have him shoot around you.
The tests should include EQ since CMSS-3D equalizes very differently and we should not get fooled by either card/solution. I suggest turning down bass for the SBX and up highs less aggressively. I can't compare EQ with the Titanium HD as I had enough o a creative mess already.
We could test the following games:
Unreal Tournament 3
Medieval Total War 2 has great sound but SBX is using elevation/macro FX both ALWAS ON, killing the experience. X-Fi with both on was the same horrendous experience.
Battlefield 2 only if I can get a cheap origin download.