head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Systems & Chaos
A horror adventure testing careful flag-tracking to dodge scripted bad endings.

Optimization · Pure Optimization
Open-world detective work testing evidence deduction without hand-holding.
Corpse Party: Blood Drive leans Optimization (Systems & Chaos); The Sinking City leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Corpse Party: Blood Drive
Light chase-evasion sequences barely tax the hands
The Sinking City
Clunky combat is deliberately undemanding
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Corpse Party: Blood Drive
Ghosts follow scripted horror triggers
The Sinking City
Monsters and citizens follow fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Corpse Party: Blood Drive
Wrong-end triggers are hidden until discovered
The Sinking City
Case clues are hidden information until investigated
The Sinking City leans a little harder on optimization, though the gap is small.
Corpse Party: Blood Drive
Mapping flag conditions for true endings is the game
The Sinking City
Cross-referencing evidence and city archives is the deduction core
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.