head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Moody Halo side story about ordinary troopers piecing together a night in New Mombasa.

Execution · Practiced Mastery
Learning scripted mission layouts and executing aim and stealth under pressure.
Halo 3: ODST leans Execution (Practiced Mastery); Syphon Filter 3 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.
Halo 3: ODST
Squishier soldier demands careful aim and positioning
Syphon Filter 3
Aim, taser timing and stealth movement carry encounters
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 3: ODST
Covenant patrols are scripted, not adaptive
Syphon Filter 3
Enemies run fixed scripts, never model the player
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 3: ODST
Open Mombasa hides clues until found
Syphon Filter 3
Enemy placements are scripted-but-unknown on first runs
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Halo 3: ODST
Firefight wave knowledge and route planning
Syphon Filter 3
Routes, gadget use and mission layouts are fully 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.