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
A top-down handheld GTA built around missions and a buy-low-sell-high drug economy.

Optimization · Systems & Chaos
An open-town horror entry with dynamic rain that intensifies the otherworld.
Grand Theft Auto: Chinatown Wars leans Optimization (Practiced Mastery); Silent Hill: Downpour leans Optimization (Systems & Chaos).
Grand Theft Auto: Chinatown Wars leans a little harder on execution, though the gap is small.
Grand Theft Auto: Chinatown Wars
Touch minigames and top-down driving need modest dexterity
Silent Hill: Downpour
Improvised melee asks little mechanical skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: Chinatown Wars
No adaptive opponents anywhere
Silent Hill: Downpour
Enemies and the Void are scripted
Silent Hill: Downpour leans a little harder on variance, though the gap is small.
Grand Theft Auto: Chinatown Wars
Drug market prices fluctuate semi-randomly
Silent Hill: Downpour
Weather shifts and side quests hide information first run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: Chinatown Wars
The drug-trading economy is the real solvable game
Silent Hill: Downpour
Routes, puzzles, and morality endings are solvable
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.