So I keep my tactics as "sneaky bastard comes suddenly on your face". Sadly, cant make much profit with T-44 and 122mm cannon. Too expensive ammo. But waiting in a bush and shooting into viewport and dealing almost 500 points of damage is something that makes warm and fuzzy feeling inside me. And before smoke clears I am away like a phantom.
T-34 seems to be a good regular tank for making money. Even if you lose it. It costs only little over 2000 credits. Profit is normaly from 10000 to 20000.