head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more execution; Resident Evil: Operation Raccoon City demands more reads.

Execution · Pure Mechanics
Push-forward arena FPS where movement and aim are the whole game.

Execution · Pure Mechanics
Squad shooting against scripted hordes with light class-loadout decisions.
DOOM (2016) leans Execution (Pure Mechanics); Resident Evil: Operation Raccoon City leans Execution (Pure Mechanics).
DOOM (2016) leans clearly harder on execution.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
Resident Evil: Operation Raccoon City
Third-person aim against zombie and soldier swarms carries the game
Resident Evil: Operation Raccoon City leans clearly harder on reads.
DOOM (2016)
Demons scripted attack patterns.
Resident Evil: Operation Raccoon City
Versus modes add human prediction; campaign AI is scripted
Resident Evil: Operation Raccoon City leans a little harder on variance, though the gap is small.
DOOM (2016)
Minimal encounter randomness.
Resident Evil: Operation Raccoon City
Infection mechanics and spawn chaos add mild unpredictability
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
Resident Evil: Operation Raccoon City
Class abilities and loadouts are a shallow solvable layer
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.