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 · Practiced Mastery
Combat racing that tests driving under fire and smart upgrade economy between races.

Optimization · Practiced Mastery
A PSP-born GTA prequel adding a business empire system to 1984 Vice City.
Death Rally leans Execution (Practiced Mastery); Grand Theft Auto: Vice City Stories leans Optimization (Practiced Mastery).
Death Rally leans a little harder on execution, though the gap is small.
Death Rally
Top-down driving and aiming under fire decide races
Grand Theft Auto: Vice City Stories
Driving, aiming, and helicopter handling on a stick
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Death Rally
AI rivals follow patterns, not your mind
Grand Theft Auto: Vice City Stories
Mission enemies are scripted and predictable
Death Rally leans a little harder on variance, though the gap is small.
Death Rally
Pickup spawns and rival aggression add run-to-run chaos
Grand Theft Auto: Vice City Stories
Mostly fixed missions with light traffic randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Death Rally
Spending winnings on the right upgrades drives the career
Grand Theft Auto: Vice City Stories
Empire-building business system layers economy onto missions
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.