Help me choose my next tier 9 tank

Einzelganger7: I love my E-75 since I got it (is like how the Tiger II should be), really tough with an alpha higher than the average among heavies of its tier so I'd say E-75 because while the T30 has an awesome frontal armor on its turret, the hull is so weak as you just said, Also the E-75 has surprisingly better mobility than the Tiger II, especially the tank traverse speed, but it all depends on your choice because yeah, the on track discount for the T30 seems good too.