head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto: San Andreas demands more optimization; Midtown Madness 3 demands more execution.

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

Execution · Practiced Mastery
Open-city checkpoint racing testing arcade car control and route knowledge.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Midtown Madness 3 leans Execution (Practiced Mastery).
Midtown Madness 3 leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Midtown Madness 3
Arcade car control through traffic is the core demand
Midtown Madness 3 leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Midtown Madness 3
AI racers follow scripted lines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Midtown Madness 3
Live traffic adds mild run-to-run noise
Grand Theft Auto: San Andreas leans clearly harder on optimization.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Midtown Madness 3
City shortcut knowledge wins checkpoint races
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.