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
Street racer with stylized arcade handling.

Execution · Practiced Mastery
Managing air meter and shortcut routes at speed on memorised tracks.
Need for Speed Unbound leans Execution (Practiced Mastery); Sonic Riders 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.
Need for Speed Unbound
Arcade drift and grip handling
Sonic Riders
Air management, drift timing and shortcuts demand practiced hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed Unbound
Online lobbies, AI cops
Sonic Riders
Versus humans there is mild positional jockeying
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed Unbound
Heat level and cop chase RNG
Sonic Riders
Item and turbulence placement adds light randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed Unbound
Car build, betting strategy, garage growth
Sonic Riders
Gear choice and shortcut routes reward track study
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.