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

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

Execution · Practiced Mastery
A kart racer testing handling execution under item-driven chaos.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Speed Punks leans Execution (Practiced Mastery).
Speed Punks leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Speed Punks
Tight kart handling and boost timing decide races
Speed Punks leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Speed Punks
Human races add light item mind-games
Speed Punks leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Speed Punks
Weapon pickups swing positions randomly
Grand Theft Auto: San Andreas leans clearly harder on optimization.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Speed Punks
Track shortcuts and item usage have learnable answers
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.