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

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

Execution · Practiced Mastery
Frozen-planet shooter about managing heat while gunning down giant bugs.
Grand Theft Auto V leans Execution (Practiced Mastery); Lost Planet: Extreme Condition leans Execution (Practiced Mastery).
Lost Planet: Extreme Condition leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Lost Planet: Extreme Condition
Grapple movement and Akrid weak-point shooting
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Lost Planet: Extreme Condition
Multiplayer modes add some mind games
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.
Lost Planet: Extreme Condition
Campaign encounters are fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Heists, money loops, builds learnable.
Lost Planet: Extreme Condition
Thermal energy management and boss weak points
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.