head to head
TrackMania 2: Stadium asks more than Need for Speed: Porsche Unleashed, and the gap is execution.

Execution · Practiced Mastery
A single-marque racer tracing Porsche's history with unusually demanding handling for its series.

Execution · Pure Mechanics
Grinding deterministic tracks for the perfect line and the flawless run.
Need for Speed: Porsche Unleashed leans Execution (Practiced Mastery); TrackMania 2: Stadium leans Execution (Pure Mechanics).
TrackMania 2: Stadium leans clearly harder on execution.
Need for Speed: Porsche Unleashed
Weighty handling model punishes sloppy inputs.
TrackMania 2: Stadium
Perfect inputs ARE the game - hundredths decide leaderboards
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed: Porsche Unleashed
AI racers run fixed lines.
TrackMania 2: Stadium
Ghost racing - opponents never interact with your run
Need for Speed: Porsche Unleashed leans a little harder on variance, though the gap is small.
Need for Speed: Porsche Unleashed
Fixed point-to-point courses; little hidden.
TrackMania 2: Stadium
Fully deterministic physics, identical track every attempt
TrackMania 2: Stadium leans a little harder on optimization, though the gap is small.
Need for Speed: Porsche Unleashed
Career car trading and upgrade economy reward planning.
TrackMania 2: Stadium
Finding the optimal racing line is half the hunt
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.