head to head
Tanki Online asks more than Grand Theft Auto V, and the gap is reads.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
Browser tank duels mixing aim, human positioning reads, and upgrade grind.
Grand Theft Auto V leans Execution (Practiced Mastery); Tanki Online leans Execution (Practiced Mastery).
Tanki Online leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Tanki Online
Aiming turrets and dodging shells decides duels
Tanki Online leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Tanki Online
Human tankers feint around corners and flag routes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Some mission and lobby randomness.
Tanki Online
Spawns and drops add light battlefield noise
Tanki Online leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Tanki Online
Equipment upgrades and loadout economy gate the grind
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.