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 free co-op top-down shooter about a marine squad purging alien-infested colonies.

Optimization · Practiced Mastery
Lara raids Siberian tombs in a stealth-action adventure heavy on puzzles.
Alien Swarm leans Execution (Practiced Mastery); Rise of the Tomb Raider 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.
Alien Swarm
Top-down aim and friendly-fire discipline
Rise of the Tomb Raider
Bow aim, stealth timing, and platforming sequences.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alien Swarm
Swarm AI scripted by director triggers
Rise of the Tomb Raider
Guards follow predictable patrol scripts.
Alien Swarm leans a little harder on variance, though the gap is small.
Alien Swarm
Spawn timing varies modestly
Rise of the Tomb Raider
Tomb unknowns dissolve after one visit.
Rise of the Tomb Raider leans a little harder on optimization, though the gap is small.
Alien Swarm
Class loadouts and route knowledge decide runs
Rise of the Tomb Raider
Tomb puzzles, crafting, and collectible routing are solvable.
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.