How is the T34/76 main gun better against infantry than the P4 main-gun? You are just making stuff up dude. Check stats before you make posts like this.
Also the Tiger is hit or miss but the IS2 is fine? Are we even playing the same game? The IS2 is indeed better than the Tiger but NOT because it has more reliable damage. The IS2 is the real RNG cannon that either misses completely or wipes 3-4 models while the Tiger does relatively consistent damage. The really good thing about the IS2 is 375 armor.
T34/76, maybe has worse DPS as the P4 because of longer reload. But it main-gun has "damage_all_in_hold", PnzIV doesn't. Any units outside the actual AoE of the weapon will be hit as if they were at the edge of the AoE. Increasing it's AI performance.
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Also the MG of T34 overperformes. It's hull-MG doese more damage as bouth MGs of Panzer 4. Which will shoot on different units. Effect, T34 kills men by men. Panzer 4 makes some squad-damage.
Comparing Tiger 1 and IS2 is difficult. In a 1vs1 IS2 will easy win. It has more AOE, but worse reload. It has hore armor. Tiger often misses same as IS2, but ist reload compensate. Better compare Pershing and Tiger, where Pershing has way better gun.
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The real differences are, that IS2 will bounce some shots instead of Tiger.