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

Optimization · Pure Optimization
Relaxing trucking sim with company-building progression.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Euro Truck Simulator 2 leans Optimization (Pure Optimization); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Euro Truck Simulator 2
Truck handling, parking, gear control
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Euro Truck Simulator 2
No adaptive opponents
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Euro Truck Simulator 2
Traffic, weather, cargo conditions
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Euro Truck Simulator 2 leans a little harder on optimization, though the gap is small.
Euro Truck Simulator 2
Company growth, route, fleet management
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.