I'm still stuck with the base 3 commanders for USF, and I must say, I am getting bored with having to play Airborne every time to have a fighting chance. Stupid War Spoils gives me nothing 90% of the time, and maybe a light tank reload bulletin for that other 10%. As such, anything other than the base three commanders is a suggestion to spend money to have a better time playing. Otherwise USF has to play those until War Spoils gives them an alternative.
OKW is probably the only faction I struggle against as Allies, since they've got a vehicle MG, they've got Obers, non-doc KTs, and Pumas AND Luchs.
There is little to no units with any kind of shock value as USF. Assault engies are so far the closest thing in that they can sometimes throw off the standard starting sturmpio-and-kubel-on-fuel combo. Every other unit the USF fields comes in time with, or after, when Axis has access to their hard counters.
Pumas alone nullify just about every USF unit except for the Jackson.
And this is why USF has to rely on overwhelming force. They simply can't counter anything directly AND reliably. As such they have to just win by sheer overwhelming force. Anything else is kind of a loss for USF.
Sorry to spoil this for you, but I've got all 6 and go airborne every game. The other 3 are not better than airborne. The strongest would be rifle company. If your playing 1v1 he might be viable.