head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
An NES run-and-gun testing reflex dodging through memorised enemy gauntlets.

Execution · Pure Mechanics
Push-forward arena FPS where movement and aim are the whole game.
Contra Force leans Execution (Pure Mechanics); DOOM (2016) 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.
Contra Force
Run-and-gun dodging through bullet-heavy NES stages
DOOM (2016)
Aim, movement, glory-kill timing all peak.
DOOM (2016) leans a little harder on reads, though the gap is small.
Contra Force
Terrorist enemies spawn on fixed scripts
DOOM (2016)
Demons scripted attack patterns.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Contra Force
Stage layouts never change
DOOM (2016)
Minimal encounter randomness.
DOOM (2016) leans a little harder on optimization, though the gap is small.
Contra Force
Character selection and power-up routing help modestly
DOOM (2016)
Rune and weapon mod picks meaningful.
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.