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.

Execution · Practiced Mastery
Fan-built ground-up remake of Half-Life with a reimagined Xen.

Execution · Practiced Mastery
Chaining mid-air kills to climb while an upgrade economy does half the lifting.
Black Mesa leans Execution (Practiced Mastery); Knightmare Tower leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Black Mesa
Classic FPS aim and platforming sequences
Knightmare Tower
Mid-air slash chaining keeps the launch alive - pure reflexes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Black Mesa
Marines and aliens follow set scripts
Knightmare Tower
Monsters spawn without any adaptive intent
Knightmare Tower leans a little harder on variance, though the gap is small.
Black Mesa
Minor enemy placement surprises first run
Knightmare Tower
Monster spawn patterns shuffle each ascent
Black Mesa leans a little harder on optimization, though the gap is small.
Black Mesa
Route, resource, and encounter knowledge
Knightmare Tower
Upgrade purchase order largely determines how high you climb
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.