head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more execution; Lara Croft: Relic Run demands more variance.

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

Execution · Pure Mechanics
Reflex swipe timing through procedurally assembled obstacle runs.
DOOM (2016) leans Execution (Pure Mechanics); Lara Croft: Relic Run leans Execution (Pure Mechanics).
DOOM (2016) leans clearly harder on execution.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
Lara Croft: Relic Run
Swipe-timed dodges at increasing speed are the core test
DOOM (2016) leans a little harder on reads, though the gap is small.
DOOM (2016)
Demons scripted attack patterns.
Lara Croft: Relic Run
No opponent; obstacles never adapt
Lara Croft: Relic Run leans clearly harder on variance.
DOOM (2016)
Minimal encounter randomness.
Lara Croft: Relic Run
Procedural track segments are unknown until they appear
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
Lara Croft: Relic Run
Upgrade and power-up choices nudge run length
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.