Shorter = less change/influence. Termination types also make for better integrity.
Some cables don't show fully their addition or subtraction (or both) to the presentation until there is a sufficient amount of it in the signal path.
If for ex I only needed one meter spkr cables, I'm not too sure just how picky I'd be. Im thinking if I needed 5 meter spkr cables it would be another story.
I've had more than one cable co tell me (depending on the application) cables need to be at least a certain length to fully realize the potential of their wire. Usually those convos were on power cables.
Shorter = less $$$$ too, so add that into the equation when folks give their input as well. Especially when it comes to speakr cables.
Common sense enters into this... eg., ICs. Some feel a half meter cable will fit into their rig. Fine. Well, if it ain't a keeper... what then? 1/2 ICs aren't nearly as 'fittable' or resellable, into some other person's rig perhaps. Same way for extended lengths.
So sometimes if money matters too, staying closer to standard cable lengths might be best
or until you settle on exactly which one you prefer.