They attack fast enough that even if T-34 pens them every shot (which is not even guaranteed) Ostwinds are the ones who usually win, one of them standing alive
So I ran this test 16 times.
8 Double Ostwind wins, 8 T-34/76 wins.
There was
one test where both Ostwinds survived, and that was because I'd placed them badly and one ate a scatter shot meant for the other.
I think a midrange slugging match between two Ostwinds and a T-34/76 is a fair fight.
Considering Lanchester's law, that makes the T-34/76
four times stronger in an Ostwind vs T-34/76 1v1.