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

Optimization · Practiced Mastery
Series finale blending stealth with active battlefields and heavy cinematics.

Execution · Practiced Mastery
Refined sequel deepening Metro's stealth and moral undercurrents.
Metal Gear Solid 4: Guns of the Patriots leans Optimization (Practiced Mastery); Metro: Last Light 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.
Metal Gear Solid 4: Guns of the Patriots
flexible gunplay alongside sneaking
Metro: Last Light
tighter gunplay than 2033, still deliberate
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metal Gear Solid 4: Guns of the Patriots
battlefield factions act on scripts
Metro: Last Light
scripted enemy encounters
Metro: Last Light leans a little harder on variance, though the gap is small.
Metal Gear Solid 4: Guns of the Patriots
mid-battle chaos mostly cosmetic
Metro: Last Light
hidden morality system opaque first time
Metal Gear Solid 4: Guns of the Patriots leans a little harder on optimization, though the gap is small.
Metal Gear Solid 4: Guns of the Patriots
camo, gear, and route knowledge per act
Metro: Last Light
stealth routes and resource management
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.