head to head
Death to Spies: Moment of Truth asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
The expanded sequel sending the SMERSH operative on more elaborate WWII infiltration missions.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Death to Spies: Moment of Truth leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Death to Spies: Moment of Truth
Stealth inputs are forgiving once the plan exists
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Death to Spies: Moment of Truth
Guards never learn from your previous attempts
Portal
No adversary modeling player.
Death to Spies: Moment of Truth leans clearly harder on variance.
Death to Spies: Moment of Truth
Initial uncertainty about patrols and objective placement
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Death to Spies: Moment of Truth
Perfect routes through clockwork levels are fully solvable
Portal
Pure puzzle-solving optimization.
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.