These are my opinions.
S Tier -
KV-1E/B - At a ripe 4.0 in RB/4.3 in AB, this is by far the best KV-1 variant for a number of reasons that brings dread in all the enemies it faces.
- The armor is thicker on the KV-1E/B overall than the KV-1 ZiS5 with 25mm applique armor on the lower hull and on the sides for extra side protection.
- You don’t face too many tanks that can just flat out rip through your armor while angled at 4.0/4.3.
- Your gun is the stock L-11 so you struggle against heavy tanks and sloped fronts, but it’s good enough to pen everything else. Post-pen damage is also good.
- This tank absolutely seal clubs in a downtier.
A Tier -
KV-1S - More like a fast heavy tank. It’s decently well protected, and has a gun with similar performance to the T-34 STZ/E. I would say its slightly worse in overall performance than the T-34 STZ/E, but it does have amazing reverse speed. It doesn’t get access to APCR rounds which makes it tough to pen some tanks, but not impossible.
SMK - The grand daddy of the KV1. For 3.7 its pretty fun and better than the regular KV-1 imho. Twin guns, decent mobility despite the size, and decent survivability with 7 crew members. The main weakness is the armor rack below the main turret that can be shot at even frontally.
KV-220 - S-tier when it was 5.7, but no longer as good at 6.0. 6.0 is a bit of a dead space in the BR ratomgs so you’re often fighting 6.3-6.7 tanks. Amazing all around armor (100mm), but sluggish mobility, and an inadequate shell for its BR. It can bully 5.0-5.7 tanks very hard, but against 6.3-6.7 tanks you aren’t going to do that well unless you play it like a flanker.
B Tier -
KV1 ZiS5 - Less armored than the KV-1E, but with a better gun that can fire APCR round. The main issue with this tank is its BR being a whole 0.7 higher than the KV-1E and you start facing 5.0+ tanks that can just rip through you like butter. Clubs in downtiers, but struggles in uptiers far worse than the KV-1E. This tank can bully jumbos and Tigers if you play it right.
KV1 L11 - The OG KV-1 at 3.7. It’s a beast if you’re facing 2.7-3.7 tanks, but it struggles against 4.0+ tanks because every country can one shot you from the front by hitting your lower hull or drivers port.
KV-122 - This tank is a baby IS-2 at a whole -1 BR lower. The 122mm gun can rip through basically everything it faces at its BR and can frontally pen Jumbos. It has the same armor as the KV-85 which is pretty inadequate, but can bounce some shots off the turret. It’s also pretty sluggish to accelerate, turn, and it’s reverse speed is worse than the KV-85. The gun depression is an issue so this tanks only good on mostly flat maps. However, if you play to its strengths (the gun and reverse speed) you can be a terror on the battlefield.
C Tier -
KV-85 - This tank is kinda mid. It has fairly underwhelming armor for its tier, sluggish mobility and turning, but has access to an 85mm gun and the amazing reverse speed from the KV-1S. You can’t push aggressively with this tank like the KV-1E/B or KV-1 ZiS5 because your armor isn’t great and you’re basically a glass cannon.
KV-2 ZiS6 - The ZiS-6 gun has amazing pen and post-pen damage and can frontally penetrate cocky Jumbo drivers from the front. The main issue with this tank is its basically a 3.7 upgunned KV-2 facing against 5.0+ tanks that have guns that well overmatch you. The reload speed is still long, but much better than the regular KV-2. It still suffers from the same issue as the KV-2 in that if you lose any loaders the reload time is punishingly bad. Definitely a good TD though, but I think the SU-85M is better.
D Tier -
KV-2 - This tank is just well… bad. It has good armor for its BR and a big derp gun, but the biggest draw back is the 35s+ reload time which is just awful. If you miss a shot or get a non pen its crippling. Also most players know you have a long reload time so they’ll just rush you after you fire. Fun for the laughs, but the SU/ISU-152/122 are far better tanks IMHO.