head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto: San Andreas demands more optimization; NBA Street demands more reads.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
Chaining flashy trick combos to fuel momentum-swinging Gamebreakers.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); NBA Street leans Execution (Practiced Mastery).
NBA Street leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
NBA Street
Trick combos and Gamebreaker timing drive scoring
NBA Street leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
NBA Street
Local versus play rewards baiting steals and blocks
Grand Theft Auto: San Andreas leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
NBA Street
Courts and AI behaviour are deterministic
Grand Theft Auto: San Andreas leans clearly harder on optimization.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
NBA Street
Trick-point economy and Gamebreaker management are the meta
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.