I don't get why ostheer is so underrepresented in this tournament, do the OKW really outclass them that much?
Things Ostheer does better:
Minesweeping (but on the other hand OKW has so much manpower and large squads that they don't even need to sweep...)
Non-fuel artillery (largely meaningless in 1vs1 outside of Semois, on which I'd say Ostheer is actually a superior choice to OKW)
Munition based artillery (useful against B4...and that's about it)
Vehicle snares (largely meaningless when you don't get the ubiquitous shrekblobs of OKW)
Long term vehicle production (no fuel penalty but huge tech costs compared to OKW)
Things OKW does better:
Everything else
Ostheer has a rather weak earlygame especially against USF. Their advantages over OKW are not particularly useful for 1vs1.