I have been playing war thunder for quite some time now and I am currently researching the T-90M and I just got the T-72B3A but it sucks compared to the T-72B3. The T-72B3 sits at what I think is a perfect br of 11.7 with the most powerful russian cannon in the game with an apfsds penetration of 578mm and it also has 3rd gen thermal, and it has the additional extra era packs on the side giving it upward of 750mm of protection with just era! So if you are looking for a tank that you might like that is in USSR, I totally recommend the T-72B3 for any player.
this tank really benefited from br decompression