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
Precise rally car control over stages that reward memorisation and tuning.

Execution · Practiced Mastery
A multi-discipline motorsport sim spanning touring cars, open-wheelers and trucks with aggressive grid racing.
Dirt 3 leans Execution (Practiced Mastery); TOCA Race Driver 3 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 3
Car control on loose surfaces is a high physical ceiling
TOCA Race Driver 3
Consistent laps and racecraft across many disciplines.
TOCA Race Driver 3 leans a little harder on reads, though the gap is small.
Dirt 3
Racing the clock or scripted AI, nobody adapts
TOCA Race Driver 3
AI rivals race aggressively but predictably.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt 3
Surface conditions and minor physics noise per run
TOCA Race Driver 3
Pack chaos and damage create incidents.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dirt 3
Stage knowledge and setup tuning reward study
TOCA Race Driver 3
Setups, braking points and discipline-specific lines reward 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.