head to head
Neither is simply harder - they are hard in different places. Dragon's Crown demands more optimization; Grand Theft Auto V demands more reads.

Optimization · Practiced Mastery
Grinding loot and builds through scripted brawler dungeons with friends.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Dragon's Crown leans Optimization (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon's Crown
Positioning and combos matter but generous brawler timing forgives slop
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Dragon's Crown
Co-op beat-em-up with scripted bosses - nothing adapts to you
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Dragon's Crown leans clearly harder on variance.
Dragon's Crown
Random loot drops and dungeon variations shape each run's gear
Grand Theft Auto V
Some mission and lobby randomness.
Dragon's Crown leans clearly harder on optimization.
Dragon's Crown
Build crafting, gear scoring and route knowledge drive endgame progress
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.