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

Optimization · Pure Optimization
A base-building survival game where you pilot a mech, automate defenses, and hold off alien swarms on a hostile planet.

Optimization · Practiced Mastery
An action RPG where leveling means choosing which Londoners to drain.
The Riftbreaker leans Optimization (Pure Optimization); Vampyr leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
The Riftbreaker
Mech combat against swarms needs active hands
Vampyr
Dodge-and-stamina melee combat with modest demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Riftbreaker
Alien waves are programmatic, not adaptive
Vampyr
Enemies follow scripted patterns
The Riftbreaker leans a little harder on variance, though the gap is small.
The Riftbreaker
Wave timing and map resources add some unknowns
Vampyr
Citizen secrets are hidden until investigated
The Riftbreaker leans a little harder on optimization, though the gap is small.
The Riftbreaker
Base layout, tech tree, and defenses dominate survival
Vampyr
The feed-or-spare XP economy is the central solvable system
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.