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
Holding clean lines at speed through traffic on memorisable point-to-point roads.

Execution · Pure Mechanics
Motion-controlled WarioWare where you snap the remote into poses to clear five-second microgames.
The Need for Speed leans Execution (Pure Mechanics); WarioWare: Smooth Moves 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.
The Need for Speed
Holding racing lines at speed through traffic is the test
WarioWare: Smooth Moves
Instant motion-pose changes and gesture accuracy under pressure
The Need for Speed leans a little harder on reads, though the gap is small.
The Need for Speed
AI rivals and police follow fixed behaviour
WarioWare: Smooth Moves
No adaptive opposition, just scripted prompts
WarioWare: Smooth Moves leans a little harder on variance, though the gap is small.
The Need for Speed
Traffic patterns add mild run-to-run noise
WarioWare: Smooth Moves
Random microgame draws keep each run unpredictable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Need for Speed
Track knowledge and car choice settle quickly
WarioWare: Smooth Moves
Learning every form and microgame solution converges
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.