I think Allied Mission 11: Panic Cycle is the easiest of "the 11s", however its first iterations were really difficult with Soviet Scud Launchers trying to take out the Battle Fortress you're supposed to escort on the move and large waves of enemy units coming straight at you during the base-vsbase phase. There've been some changes that you might notice in this playthrough, including China's use of EMP against your convoy for example.
On the other hand, while this might be the 2nd most difficult Mental Omega mission, Soviet Mission 11: Unshakeable has been made easier on all difficulties and its bugs have been fixed as well in the process. The Future Tanks will no longer fire at each other when you attempt to capture them and modifications to the array of capturable buildings in this mission will force you to use Chinese equipment instead of Russian or Pacific Front's. You still need to rush quite fast through enemy forces and reach your objective before it gets blown up and you fail the mission.
Once we're done with Act One and the 12th missions are updated, recorded & uploaded we'll begin revealing new content related to the still mysterious Side 4 and the Act Two campaign. Stay tuned!