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

Execution · Pure Mechanics
Arcade car control across loose surfaces, weather and door-to-door packs.

Execution · Practiced Mastery
Aggressive circuit racing testing car control over memorisable tracks and braking points.
Dirt 5 leans Execution (Pure Mechanics); 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.
Dirt 5
Sliding off-road cars on mixed surfaces is the whole test
Race Driver: Grid
Aggressive wheel-to-wheel car control is the core demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt 5
Pack racing adds light wheel-to-wheel jockeying
Race Driver: Grid
Online racing adds light opponent positioning awareness
Dirt 5 leans a little harder on variance, though the gap is small.
Dirt 5
Dynamic weather shifts grip unpredictably
Race Driver: Grid
Damage outcomes add slight unpredictability to contact
Race Driver: Grid leans a little harder on optimization, though the gap is small.
Dirt 5
Car class knowledge and line choice reward study
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.