JagdTiger is one of those things you rarely want to have aiming at you and that’s why you have to hide or preferably, get rid of as fast as you can.
From the front, you should first take care that it doesn’t see you, but if you have a clean shot go for either the left or the right detail on top of the hull or the middle of the bottom of the hull where the top and the bottom plate meet, provided you have the angle. And are not getting shot at.
Both sides of the turret house the ammo rack. If you see the side of the JagdTiger definitely go for those. There’s also the engine area in the back which, if critically hit should impede the JagdTigers ability to turn quite dramatically.
The back part of the hull houses the engine while the top, even though it looks strong, is only 80mm thick, which most of the time you should be able to penetrate at this level.
The ammo rack is located on the on both sides of the vehicle, in the center of the turret.