Red Locktite (271) deteriorates at temperatures above 400 degrees and will lose it's ability to hold. With repeated shooting, especially under heavy conditions (like say during a carbine class) it will fail. Rocksett does not have the torque holding properties of red Locktite (will break at a couple hundred pounds less), but it's temperature resistance is over 1000 degrees. I would definitely go with the Rocksett. It will hold the muzzle device in place during firing with no problems, will not deteriorate due to heat, and is easily removed should you decide to replace the muzzle device. Lastly, AAC includes a cute tiny bottle of it with their product so the cool factor says you must get it.
ETA - Rocksett must be heated to over 2,000 degrees for it to degrade. Locktite 271 will take up to 500 degrees before it deteriorates. Heavy use of an AR (repeated continuous shooting) will heat the barrel well above 500 degrees. Rocksett breaks free with about 30 lbs of force - but that is more than enough to keep the muzzle device in place during use. The benefit of Rocksett is not its ability to hold at high torque values, but rather to hold even after being subjected to high temperatures - something Locktite 271 just can't do.