head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Mirror's Edge Catalyst demands more execution.

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

Execution · Practiced Mastery
Open-world reboot of Mirror's Edge centered on free-running across the city of Glass.
Grand Theft Auto V leans Execution (Practiced Mastery); Mirror's Edge Catalyst leans Execution (Practiced Mastery).
Mirror's Edge Catalyst leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Mirror's Edge Catalyst
Flow-state parkour with timing-based combat
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Mirror's Edge Catalyst
Enemies are scripted obstacles
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Mirror's Edge Catalyst
Open world is static once explored
Mirror's Edge Catalyst leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Mirror's Edge Catalyst
Time trials reward optimal route discovery
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.