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

Execution · Practiced Mastery
Wrangling high-speed 3D movement through fixed stages and boss scripts.

Execution · Practiced Mastery
Track memorisation and upgrade economy layered under straightforward racing execution.
Sonic Adventure DX: Director's Cut leans Execution (Practiced Mastery); Top Gear 2 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Adventure DX: Director's Cut
High-speed 3D control and jank-wrangling demand real hands
Top Gear 2
Clean cornering and nitro timing decide finishing position
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Adventure DX: Director's Cut
Chaos bosses run fixed phase scripts
Top Gear 2
AI racers follow fixed rubber-band behaviour
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Adventure DX: Director's Cut
Stage layouts and upgrades never change
Top Gear 2
Tracks and hazards are identical every championship
Top Gear 2 leans a little harder on optimization, though the gap is small.
Sonic Adventure DX: Director's Cut
Speedrun routing and A-rank paths are learnable systems
Top Gear 2
Upgrade purchase order and track memorisation compound advantages
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.