head to head
Splinter Cell: Chaos Theory asks more than Hitman 2 (2018), and the gap is execution.

Optimization · Pure Optimization
More giant clockwork sandboxes where mapping NPC schedules is the real skill.

Optimization · Pure Optimization
Engineering silent passages through layered guard awareness systems using body-stacking and sound tools.
Hitman 2 (2018) leans Optimization (Pure Optimization); Splinter Cell: Chaos Theory leans Optimization (Pure Optimization).
Splinter Cell: Chaos Theory leans clearly harder on execution.
Hitman 2 (2018)
Minimal dexterity needed with a solid plan
Splinter Cell: Chaos Theory
Rappel aim, hand-over-hand movement, and knockouts require care
Splinter Cell: Chaos Theory leans a little harder on reads, though the gap is small.
Hitman 2 (2018)
Clockwork NPC loops, nothing adapts
Splinter Cell: Chaos Theory
Guards talk and investigate on scripted awareness trees
Splinter Cell: Chaos Theory leans a little harder on variance, though the gap is small.
Hitman 2 (2018)
Mission stories hidden until explored
Splinter Cell: Chaos Theory
Conversation triggers and item locations hold some first-run uncertainty
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Hitman 2 (2018)
Routing, disguises, and unlocks converge on solved runs
Splinter Cell: Chaos Theory
Sound-state management and multi-approach routing are the core skill
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.