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
Big Daddy POV return to Rapture with tighter combat systems.

Execution · Practiced Mastery
A colorful co-op beat-em-up with light RPG progression.
BioShock 2 leans Execution (Practiced Mastery); Castle Crashers Remastered leans Execution (Practiced Mastery).
Castle Crashers Remastered leans a little harder on execution, though the gap is small.
BioShock 2
Dual-wield drill and gun timing matter.
Castle Crashers Remastered
combo timing in co-op brawler combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
BioShock 2
Splicer AI scripted, not adaptive.
Castle Crashers Remastered
enemies scripted, no real adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
BioShock 2
Sister-gathering waves add randomness.
Castle Crashers Remastered
weapon and magic drop randomness
BioShock 2 leans a little harder on optimization, though the gap is small.
BioShock 2
Plasmid combos and gear loadouts solvable.
Castle Crashers Remastered
leveling and weapon choices 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.