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

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

Optimization · Practiced Mastery
Sequencing demolition order as a puzzle while dodging fixed patrols.
Grand Theft Auto V leans Execution (Practiced Mastery); Wrecking Crew leans Optimization (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.
Wrecking Crew
Dodging foes with no jump demands careful movement
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Wrecking Crew
Enemies cycle fixed patrol patterns
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Wrecking Crew
Every wall and ladder is visible from the start
Wrecking Crew leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Wrecking Crew
Demolition order is a solvable sequencing puzzle per stage
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.