head to head
Tom Clancy's Splinter Cell: Conviction asks more than Metal Gear Solid 2: Substance, and the gap is execution.

Optimization · Practiced Mastery
A stealth-action game where planning routes past scripted guards is the deep skill.

Execution · Practiced Mastery
An action-leaning stealth entry where aggressive optimal clears replace pure ghosting.
Metal Gear Solid 2: Substance leans Optimization (Practiced Mastery); Tom Clancy's Splinter Cell: Conviction leans Execution (Practiced Mastery).
Tom Clancy's Splinter Cell: Conviction leans clearly harder on execution.
Metal Gear Solid 2: Substance
stealth timing and aim matter
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.
Metal Gear Solid 2: Substance
guards are scripted, no adaptation
Tom Clancy's Splinter Cell: Conviction
Enemies search via scripted last-known-position logic
Tom Clancy's Splinter Cell: Conviction leans a little harder on variance, though the gap is small.
Metal Gear Solid 2: Substance
minor patrol randomness
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.
Metal Gear Solid 2: Substance
stealth routes and gadgets solvable
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.