head to head
Grand Theft Auto IV asks more than Big Rigs: Over the Road Racing, and the gap is execution.

Execution · Light / Casual
A famously broken racer that tests nothing because nothing functions.

Execution · Practiced Mastery
A grittier crime story where weighty driving and gunplay carry the experience.
Big Rigs: Over the Road Racing leans Execution (Light / Casual); Grand Theft Auto IV leans Execution (Practiced Mastery).
Grand Theft Auto IV leans clearly harder on execution.
Big Rigs: Over the Road Racing
Opponents never move; holding forward wins
Grand Theft Auto IV
Heavier driving and cover shooting reward control.
Grand Theft Auto IV leans a little harder on reads, though the gap is small.
Big Rigs: Over the Road Racing
There is no functioning opposition
Grand Theft Auto IV
Scripted AI, no adaptive opponent modeling.
Grand Theft Auto IV leans clearly harder on variance.
Big Rigs: Over the Road Racing
Nothing is hidden because nothing works
Grand Theft Auto IV
Minor mission variance.
Grand Theft Auto IV leans clearly harder on optimization.
Big Rigs: Over the Road Racing
No systems exist to solve - the game is unfinished
Grand Theft Auto IV
Mission routing and weapon picks learnable.
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.