head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more optimization; Super Meat Boy demands more execution.

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

Execution · Pure Mechanics
A brutally precise platformer about dying thousands of times.
DOOM (2016) leans Execution (Pure Mechanics); Super Meat Boy leans Execution (Pure Mechanics).
Super Meat Boy leans clearly harder on execution.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
Super Meat Boy
Pure twitch platforming, frame-perfect jumps
DOOM (2016) leans a little harder on reads, though the gap is small.
DOOM (2016)
Demons scripted attack patterns.
Super Meat Boy
No adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
DOOM (2016)
Minimal encounter randomness.
Super Meat Boy
Fully deterministic levels
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
Super Meat Boy
Route memorization optimizes times
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.