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

Optimization · Pure Optimization
A retro motorsport management sim.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Golden Lap leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Golden Lap
light racing-management input, mostly sim
Portal 2
Portal placement requires some precision but timing is lenient.
Golden Lap leans a little harder on reads, though the gap is small.
Golden Lap
AI rivals follow fixed racing logic
Portal 2
No opponent; puzzles are static.
Golden Lap leans clearly harder on variance.
Golden Lap
race incident and weather randomness
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Golden Lap
car setup and strategy optimization core
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.