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
Zelda-meets-God-of-War action adventure starring the horseman War.

Execution · Practiced Mastery
Superhero sequel adding melee combat and a karma-split power arsenal in New Marais.
Darksiders leans Execution (Practiced Mastery); inFamous 2 leans Execution (Practiced Mastery).
Darksiders leans a little harder on execution, though the gap is small.
Darksiders
combo-driven combat with dodge timing
inFamous 2
Faster combat with melee and aimed powers
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders
enemies are scripted
inFamous 2
Scripted enemy factions, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders
world and bosses are fixed
inFamous 2
Static world, fixed encounters
Darksiders leans a little harder on optimization, though the gap is small.
Darksiders
Zelda-style dungeons and upgrade routing
inFamous 2
Karma-gated power trees shape the run
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.