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

Optimization · Pure Optimization
A notoriously difficult comedy adventure where Rincewind the inept wizard must rid Ankh-Morpork of a dragon.

Optimization · Pure Optimization
A surreal point-and-click puzzle game tracing a family's dark history across generations.
Discworld leans Optimization (Pure Optimization); Rusty Lake: Roots leans Optimization (Pure Optimization).
Rusty Lake: Roots leans a little harder on execution, though the gap is small.
Discworld
Point-and-click; no manual ceiling.
Rusty Lake: Roots
Clicking hotspots; occasional timing, nothing demanding.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Discworld
Ankh-Morpork's citizens are scripted gag dispensers.
Rusty Lake: Roots
Scripted surreal events, never adaptive.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Discworld
Infamously obscure puzzle logic blindsides every first-timer.
Rusty Lake: Roots
Obtuse hidden logic is unknown until discovered; fully convergent.
Rusty Lake: Roots leans a little harder on optimization, though the gap is small.
Discworld
Byzantine item chains are brutal but fully solvable.
Rusty Lake: Roots
Cracking fixed item-and-clue chains drives every scene.
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.