Good timing on this thread, I was about to post the same question.
Adjustable stock for me, on a 16" AR set up for mid-longer range accuracy. I want a collapsible stock that doesn't rattle, but don't want to add the extra 1+ lb for the Magpul UBR stock.
If I don't care about storage, is there any advantage to the ACS vs the CTR stock? Does the ACS lock up tighter? I've handled the CTR, but not the ACS.
I'm leaning towards the ACS-L at the moment.