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
Co-op action take on Resident Evil trading dread for set-piece gunfights.

Execution · Practiced Mastery
Plannable stealth routing punctuated by precise ballistic marksmanship.
Resident Evil 5 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.
Resident Evil 5
Action-heavy aiming and melee timing carry encounters
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.
Resident Evil 5
Co-op coordination, not adversarial prediction
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.
Resident Evil 5
Mostly fixed encounters after first run
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.
Resident Evil 5
Weapon upgrades and Mercenaries routing reward planning
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.