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.

Execution · Practiced Mastery
Tests deliberate aim and squad-level planning against scripted insurgent encounters.

Execution · Practiced Mastery
Plannable stealth routing punctuated by precise ballistic marksmanship.
Operation Flashpoint: Red River leans Execution (Practiced Mastery); Sniper Elite III 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.
Operation Flashpoint: Red River
Authentic ballistics punish sloppy aim and positioning
Sniper Elite III
Ballistic long shots demand steady, compensated aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Operation Flashpoint: Red River
Insurgent AI is scripted spawns, not an adapting mind
Sniper Elite III
Enemy AI follows mappable alert and search routines
Operation Flashpoint: Red River leans a little harder on variance, though the gap is small.
Operation Flashpoint: Red River
Enemy placements are unknown until contact
Sniper Elite III
Patrol details and wind vary slightly per attempt
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Operation Flashpoint: Red River
Loadouts, class roles and approach planning decide engagements
Sniper Elite III
Open maps reward planned routes, sound masking and relocation
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.