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
An arcade FPS that scores you for killing enemies in the most creative ways possible.

Execution · Practiced Mastery
A crafting-heavy survival shooter where weapon-build optimisation and aimed dismemberment carry the loop.
Bulletstorm leans Execution (Practiced Mastery); Dead Space 3 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.
Bulletstorm
Leash, kick, and shot timing drive skillshot chains
Dead Space 3
Weapon crafting alters execution demands but shooting stays central
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bulletstorm
Enemies are scripted fodder for your combos
Dead Space 3
All enemies scripted; co-op adds coordination not prediction
Dead Space 3 leans a little harder on variance, though the gap is small.
Bulletstorm
Arenas and spawns are fixed and learnable
Dead Space 3
Scavenger bot loot adds mild RNG to crafting resources
Dead Space 3 leans a little harder on optimization, though the gap is small.
Bulletstorm
Maximising skillshot score per arena is a solvable puzzle
Dead Space 3
Deep weapon crafting system rewards systematic optimisation
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.