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.

Optimization · Practiced Mastery
A PSP stealth-action side story following Altair's hunt for Templars on Cyprus.

Execution · Practiced Mastery
A narrative third-person shooter that turns a Dubai rescue mission into a study of war's moral cost.
Assassin's Creed: Bloodlines leans Optimization (Practiced Mastery); Spec Ops: The Line leans Execution (Practiced Mastery).
Spec Ops: The Line leans a little harder on execution, though the gap is small.
Assassin's Creed: Bloodlines
Simplified PSP combat and climbing demand little precision
Spec Ops: The Line
Competent cover shooting is all the game demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Bloodlines
Templar guards are entirely scripted
Spec Ops: The Line
Enemy squads follow fixed scripted assaults
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed: Bloodlines
Compact fixed maps leave few surprises
Spec Ops: The Line
Set-piece encounters play out the same each run
Assassin's Creed: Bloodlines leans a little harder on optimization, though the gap is small.
Assassin's Creed: Bloodlines
Route knowledge and counter timing are quickly solved
Spec Ops: The Line
Cover routes and loadout choices are quickly solved
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.