Any premium tank with a high credit coefficient that you perform the best in and have a high win rate. Winning a battle gives you about twice as many credits and elite XP as a loss.
The Super Pershing has a 190% credit coefficient which is one of the highest in the game, but I have a much higher win rate in tier 5, 6, and 7 tanks, than I do in tier 8’s, so I earn more credits and elite XP in tier 5-7 tanks, than I do in tier 8’s. For example, in tanks with more than 50 battles,nI have 60% win rates in some tier 5, 6, and 7 tanks, but my highest win rate in a tier 8 tank is 55%.
I only have a 50% win rate in the Super Pershing with its 190% credit coefficient, but I have a 62% win rate in the Dracula with its 150% credit coefficient. So when I’m winning 12% more often in the Dracula, I’m earning nearly twice as many credits than when I lose a battle in my Super Pershing.