Honestly, I am very skeptical of the arguments I am seeing in this thread. Compared to the 50 cal the 20mm has the same range, the same accuracy, a similar rate of fire, 2 extra HE and an AP value of 4 and every vehicle that has the 20mm also comes with an mg 34 as well so how can it be worse? The SDKFZ 250/9 costs the same as a 50 cal jeep.
Veterancy is the only thing I can think of that would allow a 50 cal half track to defeat a 20mm one, but comparing a vet 2 unit to a vet 0 unit isn't really fair especially since, as some people have noted, the elite SPW 222 is godly.
If people still want to say that the 50 cal is vastly outperforming the 20mm then I want to see some proof instead of more annoying anecdotes.