I asked the same question a while back as my dealer was insisting that my mix of cables would not sound as good as his very expensive loom of cables. The consensus I received was the quality was the same is important and that the same manufacturer was not necessarily better.
saved me thousands.
Full loom of the same cable brand vs mixing and matching.
Some say, for synergy sake, you should use the same brand of cabling throughout your entire audio system (a full loom). However, as an audiophile for over 25 years, I've never adhered to that philosophy. As a matter of fact, I currently use three different brands of cables in my audio system with excellent results. Do you stay faithful to one brand of cables in your audio system, or do you mix and match, as I do, and why?