correct.
But no one would say: 2 SU85 are better than an ISU.
you would choose every time the ISU. because of the high wiping potential and more range...and even good AT.
a jgtiger is a shot in the own knee...when playing vs smart enemies
Side to side of ISU and JGDT:
Armour and HP: Jagd wins with 110 more frontal armour and 80 more hp and 45 less rear armour
Damage and Penetration AT: Jagd wins with 60 more dmg and 100% penetration vs all targets
Damage and penetration AI: ISU 152 wins with switchable ammunition which takes %d seconds to swap making it impossible to target both AI and AT at the same time. HE ammo is exceptionally good vs soft targets.
Rate of Fire: Jagd wins with 8.55 vs 9-11 seconds reload.
Abilities: Jagd has more if I'm not mistaken. The 128mm howitzer shell for infantry and APCBC for long range through buildings.
Maneuverability: Pretty much the same
So. Raw stats you can see that Jagd denies all allied armour while ISU denies Axis infantry charges. Seems pretty asymmetrically balanced to me. The commanders in which the units are is a different story and should be looked at separately.
Point is: You would not choose ISU to fight tanks due to the long ammo swap and difficulty staying on target (eg fast Panthers and P4s) and you wouldn't choose Jagd to fight infantry.
Soviets for AT have 85 and OKW for infantry has stukas and obers. ISU 152 complements AI power for soviets and Jagd complements AT for OKW. Although with the existance of Jagdpanzer in OKW, Jagd in smaller modes is useless. Jagdpanzer has 230 armour and 60 range making it excellent vs ally tank destroyers as the ally TDs won't penetrate 100% and JgdPanzer will.
Jagdtiger is pointless in weak hands.