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 · Pure Mechanics
A vertical bullet-hell shmup testing precise dodging through dense scripted patterns.

Execution · Pure Mechanics
A movement-shooter demanding near-perfect execution chains to maximise style rank against scripted but relentless enemies.
eXceed 2nd: Vampire REX leans Execution (Pure Mechanics); ULTRAKILL leans Execution (Pure Mechanics).
ULTRAKILL leans a little harder on execution, though the gap is small.
eXceed 2nd: Vampire REX
Dodging dense bullet patterns at speed is the entire test
ULTRAKILL
Style-ranked combat demands flawless movement, parries, and weapon-swap chains
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
eXceed 2nd: Vampire REX
Solo - enemies fire fixed scripted patterns, no adaptation
ULTRAKILL
All enemies are scripted; no adaptive human opponent exists
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
eXceed 2nd: Vampire REX
Patterns are deterministic and memorisable, little true randomness
ULTRAKILL
Enemy placement is fixed and fully readable after one pass
ULTRAKILL leans a little harder on optimization, though the gap is small.
eXceed 2nd: Vampire REX
Polarity routing and scoring systems reward learned play
ULTRAKILL
Weapon synergies and ranked-route planning form a deep 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.