I really like the T-34. Its gun can kill a panzer pretty easily with a good hit, you just have to hit it with the first shot because the reload time is so long. And most of the time, a hit to the front from a panzer doesn't even hurt it. A Tiger is a different matter altogether, you get hit by that and you're dead, it doesn't matter much what you're in. Unfortunatly, the gun on the T-34 can't kill a Tiger, trust me, I've tried doing it offline and it doesn't work. You're better off just running away when you see a Tiger.
Also, the T-34 is a good bit faster than the panzer, and you get 50% more perks for taking a tank out. And they get less for killing you. The lack of a pintle machine gun doesn't make much difference, it isn't much good for killing planes anyway, all it's good for is to make you feel like you're a little more dangerous than just a target down below.