Tiger turret is stronger, but it depends.
KV-220 turret can be penetrated, but most of these shots kill breech at best. Which means, unless KV-220 is alone and close enough to push, such hit is just a minor inconvenience, all thanks to magical internal armor plate, that I’m not sure has any reason to be there.
Tried 20 different shots, and maybe on 2 some crewmen got actually killed, but never more than 2.
This is a very good result:
This is a typical shot:
Meanwhile in Tiger E land, turret is very hard to penetrate in general:
But hull is paper. And while turret top is 40mm, hull armor is 25mm and there’s PLENTY of hull top exposed.
Which means Yak-9UT basically 1-shots you from 1000m away. 105mm HE to the lower part of the turret is a reliable 1-shot. And US and British 20mm cannons have a chance to destroy you, especially on more agile platforms that can pull up.
KV-220 is super hard to kill by planes even 500kg bombs may oftentimes fail to kill it due to 100mm armor all around, Tiger gets destroyed by 100kg bombs due to 60mm lower sides. Top armor is also very good, 40mm turret, 30mm hull, and it’s a lot harder to kill crewmen via hull top which is largely blocked by turret at most angles, basically the only way to do that is sharp dive from the front.
And regarding the gun - 85mm has insane angled performance + it basically ignores angle on add-on armor. IMO it has better overal performance than 8.8 with nuke shell regarding penetration. Of course not regarding damage, here nuke shell is a bit better. But not much.
But 1 v 1, Tiger E is way better.
I am willing to agree, the mobility is quite a big advantage. Problem is, KV-220 has better power to weight (13,6 vs 12,2). Tiger E has better reverse. So IMO there’s no clear mobility advantage.
Turret rotation is 12 on KV vs 14 on Tiger E. So some advantage goes to German tank.
KV-220 can basically tank shots for half an hour without any need to go hulldown.
So for doing “heavy tank work” it’s better.
6.0 BR for both is very reasonable, but in many battles 220 is way more effective, because it may act as a roadblock almost anywhere and Tiger E is more situational.