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

Execution · Pure Mechanics
Holding clean lines at speed through traffic on memorisable point-to-point roads.
Dirt 5 leans Execution (Pure Mechanics); The Need for Speed leans Execution (Pure Mechanics).
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
The Need for Speed
Holding racing lines at speed through traffic is the test
Dirt 5 leans a little harder on reads, though the gap is small.
Dirt 5
Pack racing adds light wheel-to-wheel jockeying
The Need for Speed
AI rivals and police follow fixed behaviour
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt 5
Dynamic weather shifts grip unpredictably
The Need for Speed
Traffic patterns add mild run-to-run noise
Dirt 5 leans a little harder on optimization, though the gap is small.
Dirt 5
Car class knowledge and line choice reward study
The Need for Speed
Track knowledge and car choice settle quickly
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.