The difference between the two is that the Matrix resolves more detail and has more extension up top. Bass balance slides slightly infavor of the Matrix as well(although it's negligable, considering proples problems with speaker set-up anyway, and thus bass is all over the place!).
The WOW is without a doubt about the best cable you'll find at that price range, and is better than $500 Audio Quest Python, and comparable to $500-900 Cardas in my oppinion(at about the same detail/rez). Actually(go figure) the WOW is competetive with the Harmonic Truth link for same money(maybe slight edge to WOW).
If you can spring for the extra bongos, at least on the amp to preamp connection, DEFINITELY get a pair of Matrix to go between amp and pre!...then use the WOW's between source componets if you are budgetting. If you can't swing the Matrix, the Wow still sounds great, only not the last word in resolution.
Love that Acoustic Zen product!