head to head
Neither is simply harder - they are hard in different places. Dark Messiah of Might and Magic demands more execution; Grand Theft Auto V demands more reads.

Execution · Practiced Mastery
First-person fantasy brawler famous for kicking every enemy off a ledge.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Dark Messiah of Might and Magic leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Dark Messiah of Might and Magic leans clearly harder on execution.
Dark Messiah of Might and Magic
first-person melee, kicks, and physics timing
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Dark Messiah of Might and Magic
enemies are scripted
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.
Dark Messiah of Might and Magic
levels are fixed
Grand Theft Auto V
Some mission and lobby randomness.
Dark Messiah of Might and Magic leans a little harder on optimization, though the gap is small.
Dark Messiah of Might and Magic
kick-into-spikes environment setups are learnable
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.