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

Execution · Practiced Mastery
Co-op zombie shooter with adaptive AI Director.

Optimization · Practiced Mastery
A tactical cover shooter where build crafting and teamwork meet real PvP reads in contested Dark Zone spaces.
Left 4 Dead 2 leans Execution (Practiced Mastery); The Division 2 leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Left 4 Dead 2
Headshots under horde pressure need aim
The Division 2
Cover shooting and positioning demand consistent aim under pressure
The Division 2 leans a little harder on reads, though the gap is small.
Left 4 Dead 2
Versus special-infected ambushes have reads
The Division 2
Dark Zone and conflict PvP feature real adaptive opponents
Left 4 Dead 2 leans a little harder on variance, though the gap is small.
Left 4 Dead 2
AI Director randomizes spawns and items
The Division 2
Named item drops and talent rolls add meaningful RNG
The Division 2 leans a little harder on optimization, though the gap is small.
Left 4 Dead 2
Route knowledge and weapon picks solvable
The Division 2
Skill builds and gear set synergies are extensively theory-crafted
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.