head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Execution · Practiced Mastery
A grimy camcorder-styled shooter dragging two criminals across Shanghai.

Execution · Practiced Mastery
A narrative third-person shooter that turns a Dubai rescue mission into a study of war's moral cost.
Kane & Lynch 2: Dog Days leans Execution (Practiced Mastery); Spec Ops: The Line 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.
Kane & Lynch 2: Dog Days
Scrappy close-range gunfights demand steady aim
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.
Kane & Lynch 2: Dog Days
Multiplayer betrayal modes add slight human reads
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.
Kane & Lynch 2: Dog Days
Fixed encounters with chaotic feel
Spec Ops: The Line
Set-piece encounters play out the same each run
Spec Ops: The Line leans a little harder on optimization, though the gap is small.
Kane & Lynch 2: Dog Days
Cover routes and arsenal knowledge
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.