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
A crossover Olympic sports collection where waggle timing and mashing form set the podium.

Execution · Pure Mechanics
Arcade driving that tests cornering execution over a small set of memorisable tracks.
Mario & Sonic at the Olympic Games leans Execution (Pure Mechanics); Need for Speed II 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.
Mario & Sonic at the Olympic Games
Motion timing and mashing rhythm decide event results
Need for Speed II
Cornering and throttle control decide every race
Mario & Sonic at the Olympic Games leans a little harder on reads, though the gap is small.
Mario & Sonic at the Olympic Games
Human rivals race in parallel; little interaction
Need for Speed II
AI racers follow rubber-banded scripts, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mario & Sonic at the Olympic Games
Events are fixed; almost no randomness
Need for Speed II
Tracks are fixed; nothing meaningful is hidden
Need for Speed II leans a little harder on optimization, though the gap is small.
Mario & Sonic at the Olympic Games
Learning each event's optimal technique caps quickly
Need for Speed II
Learning six tracks' racing lines and car choice
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.