head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
Ballistics compensation along tightly scripted sniping corridors.

Execution · Practiced Mastery
An action-leaning stealth entry where aggressive optimal clears replace pure ghosting.
Sniper: Ghost Warrior 2 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.
Sniper: Ghost Warrior 2
Breath control, wind and drop compensation on every shot
Tom Clancy's Splinter Cell: Conviction
Mark-and-execute flow rewards quick, accurate play
Tom Clancy's Splinter Cell: Conviction leans a little harder on reads, though the gap is small.
Sniper: Ghost Warrior 2
Enemies run scripted patrols and alarms
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.
Sniper: Ghost Warrior 2
Wind values randomise individual shot solutions
Tom Clancy's Splinter Cell: Conviction
Mild uncertainty in enemy search behavior
Tom Clancy's Splinter Cell: Conviction leans a little harder on optimization, though the gap is small.
Sniper: Ghost Warrior 2
Memorising target sequences and stealth routes carries missions
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.