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.

Execution · Practiced Mastery
The fastest mainline Souls, distilling the formula into aggressive boss duels.
Catherine leans Execution (Practiced Mastery); Dark Souls III leans Execution (Practiced Mastery).
Dark Souls III leans a little harder on execution, though the gap is small.
Catherine
Climbing block towers fast under time pressure
Dark Souls III
fast roll timing against aggressive scripted bosses
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
Dark Souls III
PvP invasions exist but are optional
Catherine leans a little harder on variance, though the gap is small.
Catherine
Some randomized block layouts on replays
Dark Souls III
fixed encounters converge after first sight
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
Dark Souls III
movesets and builds are fully mappable
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.