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 · Practiced Mastery
A snowboarding sim testing trick execution and line selection for high scores.

Execution · Practiced Mastery
Aggressive circuit racing testing car control over memorisable tracks and braking points.
Mark McMorris Infinite Air leans Execution (Practiced Mastery); Race Driver: Grid 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.
Mark McMorris Infinite Air
Trick timing, rotation and landing control define runs
Race Driver: Grid
Aggressive wheel-to-wheel car control is the core demand
Race Driver: Grid leans a little harder on reads, though the gap is small.
Mark McMorris Infinite Air
Solo and scored runs, no adaptive opponent
Race Driver: Grid
Online racing adds light opponent positioning awareness
Mark McMorris Infinite Air leans a little harder on variance, though the gap is small.
Mark McMorris Infinite Air
Procedural terrain adds some unpredictability
Race Driver: Grid
Damage outcomes add slight unpredictability to contact
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mark McMorris Infinite Air
Trick chaining and line selection optimize scores
Race Driver: Grid
Braking points, lines and flashback management are learnable
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.