I prefer the T-34, it has speed for manuvering, and with 1 well placed shot it will kill tiger or panzer.
1.Turn off Vehicle skins.
2.Make sure you have someone in a M-3 with supplies.( a T-34 normally takes 12 seconds too load the main gun, by having supplies dropped & putting your mouse pointer in the upper left hand corner of your screen.Everytime you fire a shot, left click, hit #2 on the keyboard, zoom again & fire.By doing this the T-34 will fire every 3 -4 seconds.)
3.The german cross on the right side of the tiger tank just above the track, aim for that spot it's a 1 shot 1 kill.
4.The left side of the tiger tank's turrent, just behind the numbers is a 1 shot 1 kill.
If you hit a panzer from close range, 1 shot too a panzer's turrent & they are done.
Don't get me wrong the T-34 has it's setbacks as well, like it won't climb hills, it has very weak armour on it's turrent, and no pintle gun on top, but the commander view the T-34 has is very good for spotting tanks.