head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Thoth demands more execution.

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

Execution · Practiced Mastery
A minimalist twin-stick shooter testing aim, movement and arena puzzle-solving.
Grand Theft Auto V leans Execution (Practiced Mastery); Thoth leans Execution (Practiced Mastery).
Thoth leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Thoth
Twin-stick aiming and dodging under pressure carries each stage
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Thoth
Enemies follow scripted geometry patterns, not adapting
Thoth leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Thoth
Spawn timing adds bursts of chaos
Thoth leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Thoth
Solving each arena's positioning puzzle is the design
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.