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.

Optimization · Practiced Mastery
Scheduling and routing a fixed 72-hour clock through zombie-filled detours.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Dead Rising 2 leans Optimization (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Dead Rising 2 leans a little harder on execution, though the gap is small.
Dead Rising 2
Crowd-clearing combat needs competence, not twitch mastery
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Rising 2
Zombies and psychopaths follow fixed behaviour
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Dead Rising 2 leans a little harder on variance, though the gap is small.
Dead Rising 2
Survivor events are scripted-but-unknown on first runs
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Dead Rising 2 leans a little harder on optimization, though the gap is small.
Dead Rising 2
The 72-hour clock makes scheduling and routing the real game
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.