Both guns have the same muzzle velocity of 800 m/s and the 122mm A-19 gun retains higher penetration at 2000 meters then the 88mm kwk36 (with penetrations kept in mind)
So i am not sure, but i think the 122mm is a flat out winner here. I do have found tough that the 88mm L/71 & 7.5cm kwk 42 have much better trajectory beyond 1000 meters then both the 122mm A-19 & 88mm kwk 36.
As it was in real life, box tank had no chance to survive when hit by 122mm.
Well if we're taking real life into the equation shouldn't we only have maps that actually allow 2km engagement distances? Reduced accuracy for Russians because of worse crews and optics? I'm not saying that the German tanks were (or should be) better but in War Thunder their characteristics are conveniently nerfed by the current conditions of the game while Russian tanks profit, and on the rare occasions the Germans can use their range advantage the Russian tanks don't seem to have that much trouble effectively firing back.
2km was rarely used in WW2. East front was fought at 1000meters but the germans were of advantage there. Not neccesarly the crews, as russian tank crew training dramaticly improved beyond 1943. But the range finding on the optics on german tanks were better then russian ones. The russian ones were much cruder and this can make heck-alot of a diffrence
Wich is also why russian tank guns today (and after ww2) have such detailed and refined tank scopes. Well. Most of them. I peered trough a T-54 tank scope once and it was very weird to look trough.