Soundcard vs Audio interface

[Gn0m4]

I would like to build a 5.2 or 5.3 setup and I have to choose between a tradicional soundcard (hardware audio decode support) vs an audio interface (software audio decode support but with 8 independent outputs).
I would like to extract decoded/equalized analog audio to active speakers.
Any advice?

http://www.asus.com/Sound_Cards_and_Dig ... ssence_ST/
http://www.asus.com/Sound_Cards_and_Dig ... s/Xonar_H6

or

http://www.esi-audio.com/products/gigaporthd+/



Thanks !

[Gn0m4]

You can answer in French.

Thanks!