Anti-cables VS. River Cable/cable lengths


Looking for some feedback regarding how these cables compare and any suggestions for other low-cost cables to consider. System: Creek 5350 se classic, Rotel 1072 player, B&W 703's. I have fairly long runs: 15 and 27 feet and am wondering how important it is to use the same length of cable for each run???

Thanks!
stuartk
Thanks Cincy_bob, for your input on both questions. What other cables have you compared with the Morrows in your decision-making process?
I found the Anti-Cables to be very fast and detailed and actually louder in volume than what they replaced, possibly due to their minimalist design, but they tended to be on the bright side, which I dislike. The prior owner of the Anti-cables, who had a 5-8 watt Almarro tube amp and horns said the same. But it all depends on your equipment
Somec59, I hate overly bright sound! My amp is quite "warm' for a s. state, however, and I could do with a bit more clarity. What are you using for amplification?
I tried the following amps: Adcom, Rotel, PS Audio, Yamaha and I settled on a 20 year old and mellow 75 watt Onkyo with a tube pre and Shaninian speakers
Stuartk, I am not a big cable-swapper, so I can't cite a litany of cable comparisons for you. However, if you check out my virtual systems and my other posts here, you will see that I listen to a lot of acoustic music and prize transparency and timbral accuracy. The Morrow cables will give you that. They compare very favorably with the Jena Labs cables, which are another very well balanced and natural sounding cable.