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

Execution · Pure Mechanics
A test of fast, precise shooting and map navigation against scripted but relentless enemies.

Execution · Pure Mechanics
A fast-paced shoot-em-up testing aim and reload management against enemy waves.
Doom (1993) leans Execution (Pure Mechanics); Let Them Come leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Doom (1993)
Precise movement and shooting against relentless enemy pressure
Let Them Come
Twitch aiming and reload timing dominate survival
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Doom (1993)
Enemies follow scripted patrol and attack patterns, not adaptive
Let Them Come
Enemy waves are scripted, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Doom (1993)
Enemy placement is fixed but unknown on first run through levels
Let Them Come
Wave composition and spawns vary somewhat
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Doom (1993)
Level routing and resource management determine survival efficiency
Let Them Come
Weapon upgrades and resource choices extend runs
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.