The difference between the Soviet 82mm and the German 81mm:
Sov:
Scatter Angle: 8
Distance Ratio: .1
Reload (Max & Min): 7.5 seconds
Ost:
Scatter Angle: 10
Distance Ratio: .08
Reload (Max & Min): 2.4 seconds
The Soviet mortar is slightly more accurate (about 20% more accurate) while the German mortar fires over 300% faster. So yes, while technically the Soviet mortar is more accurate, the German mortar in indubitably more powerful, as 3x shells fired on target in the same amount of time will have a much larger impact than a single, slightly better aimed shell.
What do you mean distance ratio?
But I
am sure the angle and distance max differences for the barrages are a huge difference. I don't think I've ever seen the GrW's barrage hit what I've aimed it at more than once, while I expect the 82 to more or less work as intended as long as the target stays still.