This is what I've put together from my own listening, and make no claims of it being 100% accurate.
THX Cinema: Gives the best wrap around effect, but maybe 'modifies' the sound too much from it's original for some listeners.
Dolby PLIIZ: Gives option of highs to play ambiance, or rears for a modified 7.1 arrangement. Sounds are more directional with less blend than THX.
Audyseey DSX: Gives the option of highs and/or wides to 'help out' the LR surrounds for taller and more blended sound range. Modifies the original recording the most of the three.
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