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
Cornering execution over memorisable circuits, with light prediction in wheel-to-wheel multiplayer.

Execution · Practiced Mastery
Tests reaction timing and memorised counter-patterns against scripted kung-fu opponents.
Grid 2 leans Execution (Practiced Mastery); Yie Ar Kung-Fu 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.
Grid 2
Car control through corners is the entire moment-to-moment test
Yie Ar Kung-Fu
Hit timing and spacing against fast opponents is the core
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grid 2
Online wheel-to-wheel adds light positional prediction
Yie Ar Kung-Fu
CPU foes use simple patterns; versus play is shallow
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grid 2
Tracks are fixed and fully visible
Yie Ar Kung-Fu
Opponent behaviour is near-deterministic once learned
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grid 2
Racing lines, braking points and car selection are studyable
Yie Ar Kung-Fu
Each foe has an exploitable pattern to memorise
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.