I have not heard any of those. If I had to bet on one or the other, it would be the Swans because of their reputation with their other desktop multimedia speakers. I know that's not much help.
At that price range, I'm actually more of a fan of not getting small satellite speaker/sub combos. I think you get better overall SQ with something like the Emotiva 4s
even though those subs with the multimedia sets might dig a little deeper. Then later on if you feel like you need more bass, add on a good subwoofer.