To me it all comes down to personal preference and need. The CTR is just a MOE stock with an additional friction lock to reduce stock wiggle. The ACS gives you some onboard storage options and a different look. Both stocks give you some additional sling attachment options which are not available on the MOE, i.e., the ability to use the quick detach slings. So to me it is a question that only the individual user can answer. For my purposes I have been completely satisfied with the MOE stocks, as I tend to keep my rifles fairly plain and simple, but you may have different requirements.