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

Execution · Practiced Mastery
Capcom's futuristic arcade beat 'em up starring four heroes battling crime across Metro City.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Captain Commando leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Captain Commando leans clearly harder on execution.
Captain Commando
Tight arcade brawling, dash attacks, throw timing
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Captain Commando
Fixed enemy formations and boss scripts
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Captain Commando
Small item and spawn variance
Grand Theft Auto V
Some mission and lobby randomness.
Captain Commando leans a little harder on optimization, though the gap is small.
Captain Commando
Stage routing and damage-efficient crowd handling
Grand Theft Auto V
Heists, money loops, builds learnable.
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.