head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Dark-fantasy Doom-engine shooter trading shotguns for elven wands and tomes.

Execution · Practiced Mastery
Memorising arcade enemy patterns and executing clean crowd control.
Heretic leans Execution (Practiced Mastery); The King of Dragons 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.
Heretic
Classic FPS strafing and aim
The King of Dragons
Spacing, blocking and crowd timing carry one-credit runs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Heretic
Monsters follow fixed 90s AI
The King of Dragons
Arcade enemies follow fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Heretic
Static level layouts
The King of Dragons
Deterministic waves once memorised
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Heretic
Secret hunting, item hoarding, and route knowledge
The King of Dragons
Enemy patterns and character upgrades route a learnable clear
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.