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
Strategic dismemberment under resource pressure, solved by upgrade planning and practiced limb-aiming.

Execution · Pure Mechanics
A Tetris variant testing piece-placement speed with multiple ruleset modes.
Dead Space (2008) leans Execution (Practiced Mastery); Tetris Worlds leans Execution (Pure Mechanics).
Tetris Worlds leans a little harder on execution, though the gap is small.
Dead Space (2008)
Precise limb-targeting under Necromorph pressure is the core skill
Tetris Worlds
Fast precise piece placement under speed is the lead
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space (2008)
Necromorphs follow fixed approach patterns, not player modelling
Tetris Worlds
Multiplayer adds light prediction but mostly solo speed
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space (2008)
Store stock is deterministic; minor drop variance on kills
Tetris Worlds
Piece bag is random but bounded and mappable
Dead Space (2008) leans a little harder on optimization, though the gap is small.
Dead Space (2008)
Weapon upgrading, power-node routing and stasis timing are optimisable
Tetris Worlds
Stacking strategies have known optimal patterns
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.