head to head
Sniper Elite III asks more than Army of Two, and the gap is optimization.

Execution · Practiced Mastery
A co-op third-person shooter built around two mercenaries juggling enemy aggro together.

Execution · Practiced Mastery
Plannable stealth routing punctuated by precise ballistic marksmanship.
Army of Two leans Execution (Practiced Mastery); Sniper Elite III leans Execution (Practiced Mastery).
Sniper Elite III leans a little harder on execution, though the gap is small.
Army of Two
Cover shooting and co-op timing
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.
Army of Two
Aggro system is mappable, not adaptive
Sniper Elite III
Enemy AI follows mappable alert and search routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Army of Two
Scripted setpieces
Sniper Elite III
Patrol details and wind vary slightly per attempt
Sniper Elite III leans clearly harder on optimization.
Army of Two
Weapon upgrades and aggro manipulation
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.