head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Execution · Practiced Mastery
A Star Wars action shooter famed for its skill-heavy lightsaber combat.
Bulletstorm leans Execution (Practiced Mastery); Star Wars Jedi Knight II: Jedi Outcast 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
Star Wars Jedi Knight II: Jedi Outcast
Saber stances and timing carry every duel
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
Star Wars Jedi Knight II: Jedi Outcast
Bosses are pattern-based; only MP duels involve humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bulletstorm
Arenas and spawns are fixed and learnable
Star Wars Jedi Knight II: Jedi Outcast
Enemy placements fixed after first encounter
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bulletstorm
Maximising skillshot score per arena is a solvable puzzle
Star Wars Jedi Knight II: Jedi Outcast
Force builds and saber-system mastery are learnable
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.