head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Pure Optimization
A physics puzzle-platformer about swapping three heroes to improvise solutions.

Optimization · Practiced Mastery
A co-op yarn puzzle-platformer where two tethered characters solve levels together.
Trine leans Optimization (Pure Optimization); Unravel Two leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Trine
Physics platforming and wizard-box stacking need dexterity
Unravel Two
Light platforming plus two-character swing coordination
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Trine
No opponent; puzzles are fixed
Unravel Two
No adaptive opposition, co-op only
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Trine
Levels are static and fully visible
Unravel Two
Fixed levels, fully visible
Trine leans a little harder on optimization, though the gap is small.
Trine
Choosing the right hero and contraption solves each obstacle
Unravel Two
Puzzles solved by routing two yarn characters together
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.