From what I've heard, Logitech pwns other 2.1s but it's kind of ugly so it depends on if you're more concerned with sound or style. And I doubt there's much of a totally noticable difference in sound between the two so I'd buy the creative labs.
I'm buying it for sound, so don't really care if it's too ugly or whatnot. I'll probably end up getting Logitech Z-3 since majority seems to think they're better.