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
Cinematic combo-action reboot of Castlevania in the God of War mold.

Execution · Practiced Mastery
Zelda-meets-God-of-War action adventure starring the horseman War.
Castlevania: Lords of Shadow leans Execution (Practiced Mastery); Darksiders 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.
Castlevania: Lords of Shadow
Combo timing, dodges, and QTE precision
Darksiders
combo-driven combat with dodge timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Lords of Shadow
Bosses and titans are fully scripted
Darksiders
enemies are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Lords of Shadow
Deterministic encounters
Darksiders
world and bosses are fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Lords of Shadow
Combo unlocks and learning fixed movesets
Darksiders
Zelda-style dungeons and upgrade routing
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.