Both come in completely different factions. OST is designed to play around mg42, USF is not. And ironic both of you completely ignored the AT gun
Because an AT gun isn't vital in the early game when compared to a reliable source of area denial and suppression. It wasn't really worth bringing up. By the time an AT would be required I could have just built one from standard (or as as standard as the dogshit terrible teching system for usf gets) teching as USF....
OST may have been designed to play around the MG42 at one point but that point was likely 2016.
Just building a sniper as Ost will cancel out USF with no reliable counter.