The NA’s are really fun to play with. Amon and I have been playing a few games with all 30 LHTR 2.0 NA’s in play. My gut says that the Allies have the advantage when all the NA’s are in play because they have so many that work so well together - Joint-Strike/Marines for example. The Axis have some nice practical ones like Panzerblitz, Luftwaffe Divebombers, Atlantic Wall, Banzai!, and the two battleship NA’s.
Enigma Decoded allows the UK to retreat their tank and fighter in Egypt to T-J and allows a first turn attack on the German med fleet of 2 fighters, and a bomber. Alternatively, to protect the US Chinese Divisions, French Indochina can be attacked with 3 inf, 2 fighters(the one from T-J and z35). The Russian Railroad allows the Buryatia infantry to help defend Sinkiang on R2. With the starting infantry, the Chinese Divisions, possible T-34’s, and some British fighters, at times, the Allies are able to push forward to China.
Even in the Atlantic, fast carriers are better than I would have expected. Especially if America goes into the med - or in my current predicament, the IJN in the South Atlantic. War Economy has also been a real help since I use it at least once every turn. Mech Infantry is all around great. If Japan is playing passively against a Colonial Garrison in India, then the US units marching across Africa may be in time to support the factory.