head to head
Neither is simply harder - they are hard in different places. Manhunt 2 demands more variance; Portal 2 demands more optimization.

Optimization · Pure Optimization
A transgressive stealth horror game about an asylum escapee executing hunters from the shadows.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Manhunt 2 leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Manhunt 2 leans a little harder on execution, though the gap is small.
Manhunt 2
Execution-hold timing and stealth movement need steady hands
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Manhunt 2
Hunter AI patrols on fixed search scripts
Portal 2
No opponent; puzzles are static.
Manhunt 2 leans clearly harder on variance.
Manhunt 2
Unknown patrol layouts until a level is scouted
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Manhunt 2
Shadow routes and lure setups make levels solvable puzzles
Portal 2
Solving the puzzle's logic IS the entire 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.