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

Execution · Pure Mechanics
A long-running hardcore racing simulator prized for its tire physics and online racing.

Execution · Practiced Mastery
Simulation driving precision underpinned by setup tuning and race strategy.
Live for Speed leans Execution (Pure Mechanics); Project CARS leans Execution (Practiced Mastery).
Live for Speed leans a little harder on execution, though the gap is small.
Live for Speed
Hardcore sim handling rewards perfect car control
Project CARS
Braking points and wheel control at the sim limit
Live for Speed leans a little harder on reads, though the gap is small.
Live for Speed
Online racecraft against human rivals
Project CARS
Online racecraft against humans adds light positional prediction
Project CARS leans a little harder on variance, though the gap is small.
Live for Speed
Deterministic physics, no weather lottery
Project CARS
Dynamic weather injects some session randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Live for Speed
Setups and racing lines converge to known optima
Project CARS
Setup tuning and pit strategy reward deep 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.