Infantry Company of heroes 2. 0cp sandbags and mines for Riflemen. Mortar halftrack that performs close to the Ostheer one ( + fuse barage rek OKW buildings), double LMG riflemen vet3 .
But all this does not matter because Soviet will be strongest by far in 1v1. The ability to get T1 and T2 up for free (almost) is amazing.
Armor, Inf, Rifle doctrines meta. I'll also give a try to Para since Thompson are now downgrading your mid-long native dps anymore.