The Russians had a wide selection of tanks in 42 light to heavy tanks.(KV-1/2 being the most feared )
The Germans was limited with their selections in Stalingrad and the P4g in game was the best they had to offer in 42.
Possible Russian tank for stalingrad
A possible German tank
Contrary to popular belief the Germans never held tank superiority on the eastern front.While the Tiger was a great tank it was never made in enough numbers to effect the war(and wasn't in Stalingrad).And the Panther was again a great tank but by the time they got it into production the Russians was pumping out T-34/85's and IS-2 tanks in
far greater numbers.German advantage was in crew training and radio equipment.
On the eastern front the Germans never quite wrestled tank supremacy away from the Red Army.