head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more execution; Tropico 6 demands more variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
Banana-republic management; juggle factions and the treasury.
Portal 2 leans Optimization (Pure Optimization); Tropico 6 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Tropico 6
pausable management
Tropico 6 leans a little harder on reads, though the gap is small.
Portal 2
No opponent; puzzles are static.
Tropico 6
factions scripted not adaptive
Tropico 6 leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Tropico 6
election events, disasters
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Tropico 6
economy and faction balance solvable
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.