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

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

Optimization · Pure Optimization
Methodical dungeon mapping and puzzle-solving with token real-time combat.
Portal 2 leans Optimization (Pure Optimization); Stonekeep 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.
Portal 2
Portal placement requires some precision but timing is lenient.
Stonekeep
Real-time mouse swings need only basic timing
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.
Stonekeep
Dungeon denizens follow fixed scripts
Stonekeep leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Stonekeep
Unmapped corridors and secrets are scripted-but-unknown
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
Stonekeep
Mapping, rune magic and inventory puzzles are the real test
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.