head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more optimization; Race the Sun demands more variance.

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

Execution · Pure Mechanics
Pure reflex weaving through procedurally shuffled obstacle fields before sundown.
DOOM (2016) leans Execution (Pure Mechanics); Race the Sun 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 (2016)
Aim, movement, glory-kill timing all peak.
Race the Sun
Split-second weaving at ever-rising speed is the whole test
DOOM (2016) leans a little harder on reads, though the gap is small.
DOOM (2016)
Demons scripted attack patterns.
Race the Sun
Obstacles never predict you
Race the Sun leans clearly harder on variance.
DOOM (2016)
Minimal encounter randomness.
Race the Sun
Procedural daily worlds keep layouts unknown
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
Race the Sun
Powerup priorities and scoring lines are quickly learned
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.