I think most likely your best answer is going to come from the manufacturer of the cables you're considering. There is no pat. answer to this question. It depends on whose cabling you're using or going to use.
At one time my own personal experience with many cable makes lead me to believe there was a one trick pony answer. But after seeing a post by Sean in a certain thread earlier this year (which I can no longer find), and considering the uniqueness of our product line (which I had never really done...shame on me), I went back and visited this with our own products. To my surprise, I found my previously held beliefs did not hold up.
Out of this, I've concluded that the answer really should be answered to full benefit by each manfacturer as they should be familiar with how their cabling's topology, build materials, etc. play into their cable's performance as a system of I/Cs and S/Cs and which is better: Longer S/Cs with Shorter I/Cs or visa versa.
For example, Mapleshade, I believe, says the best S/C length is 8ft. I have no doubt that may be true for their offering but it isn't true for us and I bet for at least many other manufacturers.
Again, there is no broad brush stroke answer.
Hope this helps.
Cheers! and Kind Regards,