head to head
The Legend of Zelda: Phantom Hourglass asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
Touch-controlled DS Zelda centered on re-running a timed stealth dungeon ever faster.
Portal leans Optimization (Pure Optimization); The Legend of Zelda: Phantom Hourglass leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
The Legend of Zelda: Phantom Hourglass
Stylus controls are simple and forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
The Legend of Zelda: Phantom Hourglass
Phantoms patrol fixed routes
The Legend of Zelda: Phantom Hourglass leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
The Legend of Zelda: Phantom Hourglass
Sea exploration unknowns first run
Portal leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
The Legend of Zelda: Phantom Hourglass
Temple of the Ocean King rewards optimized repeat routing
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.