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

Optimization · Practiced Mastery
An atmospheric open-zone survival shooter set in the Chernobyl exclusion zone.

Execution · Practiced Mastery
Co-op incursions balancing careful gunplay against randomised objectives and extraction risk.
S.T.A.L.K.E.R.: Shadow of Chernobyl leans Optimization (Practiced Mastery); Tom Clancy's Rainbow Six Extraction leans Execution (Practiced Mastery).
Tom Clancy's Rainbow Six Extraction leans a little harder on execution, though the gap is small.
S.T.A.L.K.E.R.: Shadow of Chernobyl
Ballistic gunplay punishes sloppy aim
Tom Clancy's Rainbow Six Extraction
Precise shooting and stealth movement keep squads alive
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
S.T.A.L.K.E.R.: Shadow of Chernobyl
A-Life feels alive but doesn't model you
Tom Clancy's Rainbow Six Extraction
Alien archaeans run on scripted-random behaviour, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
S.T.A.L.K.E.R.: Shadow of Chernobyl
Anomalies, mutant spawns, and artifact RNG hide information
Tom Clancy's Rainbow Six Extraction
Mutating zones and randomised objectives hide each incursion's shape
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
S.T.A.L.K.E.R.: Shadow of Chernobyl
Artifact economy, routes, and stash knowledge converge
Tom Clancy's Rainbow Six Extraction
Operator loadouts and risk-versus-extract decisions reward system mastery
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
S.T.A.L.K.E.R.: Shadow of Chernobyl →
full breakdown
Tom Clancy's Rainbow Six Extraction →