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.

Optimization · Practiced Mastery
The original European trucking sim of long hauls and tidy deliveries.

Optimization · Pure Optimization
Quiet side-scrolling journey piloting a land-ship across a dried-out sea.
Euro Truck Simulator leans Optimization (Practiced Mastery); FAR: Lone Sails leans Optimization (Pure Optimization).
Euro Truck Simulator leans a little harder on execution, though the gap is small.
Euro Truck Simulator
Basic truck handling and parking
FAR: Lone Sails
Light platforming and timely lever pulls
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Euro Truck Simulator
No adaptive opposition
FAR: Lone Sails
No opponent of any kind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Euro Truck Simulator
Minor traffic variation
FAR: Lone Sails
Mostly fixed obstacles, minor unknowns first run
FAR: Lone Sails leans a little harder on optimization, though the gap is small.
Euro Truck Simulator
Delivery routes and truck upgrades
FAR: Lone Sails
Fuel management and ship-routine efficiency are the game
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.