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
A gothic horror FPS where a paranormal investigator fights a family curse with revolver in one hand and spells in the other.

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.
Clive Barker's Undying leans Execution (Practiced Mastery); Red Dead Redemption leans Execution (Practiced Mastery).
Clive Barker's Undying leans a little harder on execution, though the gap is small.
Clive Barker's Undying
Dual-wielding spells and guns under pressure
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Clive Barker's Undying
Horrors follow scripted patterns despite feeling malevolent
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Clive Barker's Undying leans a little harder on variance, though the gap is small.
Clive Barker's Undying
First-run scares and unknown manor secrets hide information
Red Dead Redemption
Ambient events and spawns vary mildly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Clive Barker's Undying
Spell upgrades and Scrye-revealed puzzles reward system mastery
Red Dead Redemption
Mission approaches and economy 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.