I use both, Specialization if im mainly doing infantry warfare and massed attack if im doign tank warfare

I usually make units with specialisation, and then switch to balanced

Balanced when my mp gain is low. Specialized when mp gain is pretty high

Massed attack for extra mp and then switch to specialisation

I used to use doctrines but I don't find much use in changing them anymore

Im sorry but the ones who choose specialization are always the guys who ask for mp :d

Not really. Once my mp is low I'll switch to balanced lol

I use specialization because i prefer Quality better than Quantity but sometimes if im out of manpower i just switch to massed attack because im usually using a small or country that have a problem with its neighbour

I use massed attack early game for tank spam. If im big country i do balanced since specialization just gives less manpower increase and longer deployment time while balanced changes nothing. If i'm big country i go for generals instead.