I have both, and I prefer them for different roles. I like the fixed MOE for stand/blind hunting where I dont have to carry it a ton. I get a great cheek weld, and does better for more precision shooting because I feel it is more stable (whether it is remains to be seen). I run the ACS-L on my 68, and I love it as well. It does give adjustability, but I'm not sure the "fit" is any better for me. I like it because it because it's not terribly heavy, and it's easy to walk around with. Honestly, it's 6 of one, half-dozen of another. Both are great options, can't go wrong.