head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more execution; WWF Royal Rumble demands more reads.

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

Execution · Pure Mechanics
Grapple-timing execution and mashing stamina in arcade wrestling matches.
DOOM (2016) leans Execution (Pure Mechanics); WWF Royal Rumble leans Execution (Pure Mechanics).
DOOM (2016) leans clearly harder on execution.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
WWF Royal Rumble
Grapple timing and button mashing decide every lock-up
WWF Royal Rumble leans clearly harder on reads.
DOOM (2016)
Demons scripted attack patterns.
WWF Royal Rumble
Human opponents add some habit prediction in versus
WWF Royal Rumble leans a little harder on variance, though the gap is small.
DOOM (2016)
Minimal encounter randomness.
WWF Royal Rumble
Little is hidden beyond grapple outcome wobble
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
WWF Royal Rumble
Move utility knowledge is 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.