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
A first-person stealth-action prison break starring Vin Diesel's antihero in a brutal slam.

Execution · Practiced Mastery
An action-leaning stealth entry where aggressive optimal clears replace pure ghosting.
The Chronicles of Riddick: Escape from Butcher Bay leans Execution (Practiced Mastery); Tom Clancy's Splinter Cell: Conviction 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.
The Chronicles of Riddick: Escape from Butcher Bay
First-person brawling and shooting need solid timing
Tom Clancy's Splinter Cell: Conviction
Mark-and-execute flow rewards quick, accurate play
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Chronicles of Riddick: Escape from Butcher Bay
Guard AI is patterned, not adaptive
Tom Clancy's Splinter Cell: Conviction
Enemies search via scripted last-known-position logic
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Chronicles of Riddick: Escape from Butcher Bay
Patrol details unknown on a first run
Tom Clancy's Splinter Cell: Conviction
Mild uncertainty in enemy search behavior
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Chronicles of Riddick: Escape from Butcher Bay
Learning routes, shadows and encounters makes runs clean
Tom Clancy's Splinter Cell: Conviction
Encounter rooms have clear optimal clear orders
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.
full breakdown
The Chronicles of Riddick: Escape from Butcher Bay →
full breakdown
Tom Clancy's Splinter Cell: Conviction →