head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more optimization; Micro Machines 2: Turbo Tournament demands more reads.

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

Execution · Pure Mechanics
Twitchy miniature racing where screen-edge duels punish imprecise hands.
DOOM (2016) leans Execution (Pure Mechanics); Micro Machines 2: Turbo Tournament leans Execution (Pure Mechanics).
DOOM (2016) leans a little harder on execution, though the gap is small.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
Micro Machines 2: Turbo Tournament
Twitchy top-down handling on tabletop tracks is the core test
Micro Machines 2: Turbo Tournament leans clearly harder on reads.
DOOM (2016)
Demons scripted attack patterns.
Micro Machines 2: Turbo Tournament
Screen-edge duels reward predicting human rivals' lines
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.
Micro Machines 2: Turbo Tournament
Tracks fixed, almost nothing random
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
Micro Machines 2: Turbo Tournament
Memorising shortcuts and racing lines per track
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.