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.

Execution · Practiced Mastery
Global flight sim built on real weather and procedures.

Optimization · Practiced Mastery
Methodically mapping a hostile station where knowledge and routing beat reflexes.
Microsoft Flight Simulator (2020) leans Execution (Practiced Mastery); System Shock leans Optimization (Practiced Mastery).
Microsoft Flight Simulator (2020) leans a little harder on execution, though the gap is small.
Microsoft Flight Simulator (2020)
Procedure execution, instrument flying skill
System Shock
Combat and cyberspace ask competent but dated reflexes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Microsoft Flight Simulator (2020)
No adaptive opponents, ATC scripted
System Shock
SHODAN's threats are scripted, not an adapting mind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Microsoft Flight Simulator (2020)
Real weather and live traffic
System Shock
Citadel's layout and logs are hidden until uncovered
System Shock leans a little harder on optimization, though the gap is small.
Microsoft Flight Simulator (2020)
Flight planning, systems mastery, routing
System Shock
Inventory, routing and station knowledge solve the game
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.