Ostheer 2v2:
-Mechanized assault: Assault grenadiers are strong, close game early game infantry, stugE which is a good anti infantry tank, and the tiger in the end.
-Elite Troops: G43's are really good on grenadiers. You get good accuracy while you are moving, stun grenades are not bad as well, tiger ace only costs manpower but is amazing! However you can only call in one and when you do your manpower income will be reduced with 75% i believe (which is a lot) untill it dies. Nevertheless great commander.
- Fortified Armor Doctrine: Command p4 is really good against infantry and gives a buff to your other units, recon plane which is always good, and of course the elephant which is the best anti tank tank in the game.
- Spearhead Doctrine: Also a really good commander, it has the mortar halftrack which is really good against people who camp and you have recon and a bombing run which you can use to take out a howizter of your enemy. The tiger is of course good as well.
Okw 2v2:
-Fortifications Doctrine: S-mines are really good against infantry and you can lay bunkers with your volks, the pak43 is really good against tanks, the howizter is of course great against campers and the arty you can call in with your munition fires faster and faster the longer vision you have on your enemy.
-Scavenge Doctrine: This is also a good doctrine, maybe not the best in 2v2 though. The call in infantry is really good and you can call them in behind the lines. The grenades are great as well, you get more resources from the things you salvage as well. The ostwind is great against infantry and the call in artillery is really good and too.
Uk 2v2:
-Vanguard operations Regiment: Good commander call in, the officer is absolutely amazing and kills models really fast on almost all ranges and has great grenades. The call in strafe is good against infantry AND tanks! The churchill is good against infantry and tanks as well and you can get vehicle repairs in exchange for munition.
-Special Weapons Regiment: The boys at rifles are really good against light vehicles, the resupply halftrack gives great weapons that you can drop for you infantry sections. They are really really good believe me. The late game arty is a bit like the rail way artillery from the ostheer and is devestating. And ofcourse the churchill again, which is always good.
Hope this was usefull