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

Execution · Practiced Mastery
A third-person action platformer where you blast scripted alien hordes while leveling an arsenal of gadgets.

Optimization · Practiced Mastery
Hybrid tower-defense testing maze optimization backed by first-person aim.
Ratchet & Clank: Into the Nexus leans Execution (Practiced Mastery); Sanctum 2 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.
Ratchet & Clank: Into the Nexus
Aiming, strafing, and platforming under fire carry combat
Sanctum 2
Weak-point shooting during waves carries real aim demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Ratchet & Clank: Into the Nexus
Scripted enemy waves; no adaptive opponent
Sanctum 2
Alien waves path predictably toward the core
Sanctum 2 leans a little harder on variance, though the gap is small.
Ratchet & Clank: Into the Nexus
Fixed level layouts, minimal hidden information
Sanctum 2
Wave compositions vary mildly between maps
Sanctum 2 leans a little harder on optimization, though the gap is small.
Ratchet & Clank: Into the Nexus
Weapon upgrade paths, bolt economy, gold bolt routing
Sanctum 2
Maze layouts and tower economics are the solvable heart
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.