Hmm, you managed to salvage an creative sound card and you are asking us which sound better? Why not test it out yourself and find out? If you can't hear a difference then dont bother. Asking us to tell you which is "Better" so that you wouldn't miss a "wasted" opportunity to use it is silly. Try it on! turn if off! is it better?
You mentioned that you aren't an audiophile so it the answer isn't that important. But if you really must know, Technically the soundcard is supposed to give you better sound, but nowadays onboard audio is good enough that most cant really tell a difference. Especially with that high end motherboard that you are using.
Also, I noticed you are using a the razer leviathan. Perhaps thats why you cant tell any difference. Try using a earphones or headset. I think sound quality difference is more apparent in those mediums