I’ve always used the same length. The draw back is one cable may have to be coiled, the one nearest to your components or rack. Alternatively, the cable could be looped I suppose. However, I do not detect any detrimental effect on the sound by coiling. I'm a perfectionist, so I am compelled to use the same length, whether I hear a difference or not.
How important is it to have identical speaker cable length?
I have a situation where my speakers are different distances from my amp. Would it be wrong to pair a 3-meter cable to one speaker and a 2-meter cable to the other or is it really just a theoretical issue? Many thanks in advance for your thoughts!