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

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

Optimization · Pure Optimization
Patience-driven crop scheduling and token economics in a browser farm.
Portal 2 leans Optimization (Pure Optimization); Sunflower Land leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Sunflower Land
Clicking crops requires no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Sunflower Land
No adaptive opponent in farming loops
Sunflower Land leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Sunflower Land
Market prices and seasonal events add modest unknowns
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Sunflower Land
Crop timing, resource chains and trade economics are the 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.