My opinion:
If you're newish to this DIY thing and don't have many (if any) boutique audiophile gear, I would definitely go with the Cardas.
There is probably some sonic difference between the Cardas and WBT jacks. However, for one, you need to be very skilled or else cables employing either jack won't sound good. Second, you really need very, very good sources to hear the difference.
If you're using a Sony CD player with a noisy clock and noisy power supply, the cables may just make you more aware of the imperfections, which is probably not what you want.
These are just my two cents. I latched onto the cable craze, but I decided to put all my cable projects onto the backburner until my sources were of reasonable quality to benefit from them.
b