head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Indiana Jones and the Great Circle demands more optimization.

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

Optimization · Practiced Mastery
First-person Indy adventure sneaking and punching across 1937's mystery sites.
Grand Theft Auto V leans Execution (Practiced Mastery); Indiana Jones and the Great Circle leans Optimization (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Indiana Jones and the Great Circle
First-person brawling and stealth timing
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Indiana Jones and the Great Circle
Fascist guards follow mappable AI
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.
Indiana Jones and the Great Circle
Guard layouts surprise on first infiltration
Indiana Jones and the Great Circle leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Indiana Jones and the Great Circle
Puzzle shrines and stealth route planning
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.