DPS of single BAR on vet0 rifleman - 10.479/5.656/2.950
DPS of single 1919 on vet0 rifleman - 6.174/8.805/9.041
DPS of single Mg-34 on vet0 ober - 11.561/16.802/16.833
DPS of single Stg-44 on vet0 ober - 26.152/12.649/4.274
Bouth are 60 ammo, you can't shoot while moving with Mg-34, but your DPS at far range is 5,7 times better than BAR's and still even better at close. You want mobile platform - you have 2 Stgs for 60mu, each of them have DPS of 2 BARs. What is Debatable?
As you said dps on the move, the animation of going prone with the 42 gives a delay which is also to be considered in dps, alternatively you can equip rear echelons and why are you comparing obers elite inf to mainline inf rifleman, seems a bit disingenuous... Either way it cannot be objectively better in every scenario.