Since I am kinda new, can you elaborate why Ostheer has the disadvantage and OKW less so?
OH: tellers (which most won't use or has limited ammo due to LMG/Medic/Nade) and pak (requires preparation) are your main sources against both T70/Quad/Stuart. PG with shrecks is a bleed trap (early on) and 222 requires micro and some supplementary AT (unless you build 2 and it's way too risky).
You could go Mobile defense and get a Puma, but that locks your options.
OKW: on the other hand, you have "spammable" shrecks/raks. You still have mines and if you go mechanized you have Pumas which basically locks down any T3 play. All of this is way easier to use for the average joe.