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

Optimization · Pure Optimization
A survival RPG testing resource management and city knowledge against the coming winter.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Hobo: Tough Life leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Hobo: Tough Life
Survival is menus and walking, not reflexes
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.
Hobo: Tough Life
NPCs run static dispositions, not adaptive minds
Portal 2
No opponent; puzzles are static.
Hobo: Tough Life leans clearly harder on variance.
Hobo: Tough Life
Weather, NPC moods and scavenging rolls pressure plans
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Hobo: Tough Life
Managing hunger, money and winter prep is the real game
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.