head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Execution · Practiced Mastery
A grimy camcorder-styled shooter dragging two criminals across Shanghai.
Grand Theft Auto V leans Execution (Practiced Mastery); Kane & Lynch 2: Dog Days leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Kane & Lynch 2: Dog Days
Scrappy close-range gunfights demand steady aim
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Kane & Lynch 2: Dog Days
Multiplayer betrayal modes add slight human reads
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.
Kane & Lynch 2: Dog Days
Fixed encounters with chaotic feel
Grand Theft Auto V leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Kane & Lynch 2: Dog Days
Cover routes and arsenal knowledge
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.