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.

Execution · Practiced Mastery
Anxiety-fueled block-climbing puzzler wrapped in a relationship-drama narrative.

Optimization · Practiced Mastery
A minimalist action adventure about toppling sixteen colossal puzzle-bosses.
Catherine leans Execution (Practiced Mastery); Shadow of the Colossus leans Optimization (Practiced Mastery).
Catherine leans a little harder on execution, though the gap is small.
Catherine
Climbing block towers fast under time pressure
Shadow of the Colossus
Climbing, grip management, and sword timing on moving giants.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Catherine
Versus mode exists but is niche
Shadow of the Colossus
Colossi follow fixed behavior patterns.
Catherine leans a little harder on variance, though the gap is small.
Catherine
Some randomized block layouts on replays
Shadow of the Colossus
Encounters play out nearly identically each attempt.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Catherine
Block-technique vocabulary solves each tower
Shadow of the Colossus
Each colossus is a solvable climbing puzzle.
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.