head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Managing air meter and shortcut routes at speed on memorised tracks.

Execution · Practiced Mastery
An open-world racing MMO about collecting cars and cruising Ibiza and Hawaii.
Sonic Riders leans Execution (Practiced Mastery); Test Drive Unlimited 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 Riders
Air management, drift timing and shortcuts demand practiced hands
Test Drive Unlimited 2
Open-road car control decides races
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Riders
Versus humans there is mild positional jockeying
Test Drive Unlimited 2
Online rivals add mild jockeying
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Riders
Item and turbulence placement adds light randomness
Test Drive Unlimited 2
Traffic and weather add small noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Riders
Gear choice and shortcut routes reward track study
Test Drive Unlimited 2
Car choice, upgrades, and route knowledge compound
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.