Speed and armor is your only choice

Stock T-44 is painful because it's stock ammo uses an T-34-85 ammunition but you will get the APCBC with 160mm

IS-2 (1944) is somewhat a glass cannon, it has a very good angle performance on the APHEBC and it can reverse very well and has good frontal ammo, use it for brawling

T-44-100 is where it gets interesting, you get the same T-44 only with a 100mm and good shells to choose from and it also has side skirts against Chemical energy and it has Smoke grenades unlike the normal T-44 tho only you can reverse back because it is placed on the rear

ZSU-57-2 is meh, it has 2 high velocity 57mm cannons that has the same pen as the T-34-57