SU-122-44
The SU-122-44 certainly doesn’t seem like a particularly economical choice when you consider its accuracy is pretty poor and the shell cost is over 1000 credits a pop, but it ranks highly in the most profitable Tier 7 Premiums regardless. Why? Well, because it shreds tanks to pieces like no other.
Over 3000 DPM with 390 alpha damage at Tier 7 is frankly insane, and you more than make up for cost-per-shot with sheer damage output. Not only this, but the SU sports high mobility and decent armor, allowing it to position itself wherever necessary and bounce quite a few return shots from Mediums and lower Tiers.