Everything you can buy in the store is cosmetic. The tanks there are the same exact ones that can be unlocked by researching for free. The first tanks you get are actually very good, the later tanks that are unlocked are also good but they aren't better than any of the others they really only offer different playstyles or challenges.
 "Incremental Epic Hero 2"){kind=icon}
 "Grow Defense"){kind=icon}
 "DPS IDLE"){kind=icon}
 "Random Number GOD Idle"){kind=icon}
 "Idle Zoo"){kind=icon}
 "Mighty Party"){kind=icon}
 "Incremental Adventures"){kind=icon}
 "Crush Crush"){kind=icon}
 "Diebrary"){kind=icon}
 "Firestone Idle RPG"){kind=icon}
 "Raid Heroes: Sword and Magic"){kind=icon}
 "STUG"){kind=icon}
 "Raid Heroes: Total War"){kind=icon}
 "ZS Dead Detective - Pumpkin Dead"){kind=icon}
 "Medieval Cop -The Invidia Game - Part 1"){kind=icon}
 "Learn to Fly 2"){kind=icon}
Everything you can buy in the store is cosmetic. The tanks there are the same exact ones that can be unlocked by researching for free. The first tanks you get are actually very good, the later tanks that are unlocked are also good but they aren't better than any of the others they really only offer different playstyles or challenges.