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

Execution · Pure Mechanics
Treasure's Mega Drive boss-rush gauntlet demanding flawless execution against giant setpieces.

Execution · Pure Mechanics
Push-forward arena FPS where movement and aim are the whole game.
Alien Soldier leans Execution (Pure Mechanics); DOOM (2016) leans Execution (Pure Mechanics).
Alien Soldier leans a little harder on execution, though the gap is small.
Alien Soldier
Frame-tight dodges across thirty-plus bosses
DOOM (2016)
Aim, movement, glory-kill timing all peak.
DOOM (2016) leans a little harder on reads, though the gap is small.
Alien Soldier
Bosses fully scripted
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.
Alien Soldier
Nothing hidden after one loop
DOOM (2016)
Minimal encounter randomness.
Alien Soldier leans a little harder on optimization, though the gap is small.
Alien Soldier
Weapon loadout and moveset mastery solvable
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.