head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Light / Casual
Relaxed flight and exploration with light puzzles, almost no skill ceiling.

Optimization · Light / Casual
A surreal driving game of using light to guide giant creatures away.
AER: Memories of Old leans Optimization (Light / Casual); Titan Chaser leans Optimization (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
AER: Memories of Old
Flight is freeform and failure-free
Titan Chaser
Driving and using light - low twitch demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
AER: Memories of Old
No adversary exists in the world
Titan Chaser
Titans are scripted, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
AER: Memories of Old
Islands and ruins are fixed once explored
Titan Chaser
Fixed scenarios, minimal randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
AER: Memories of Old
Light ruin puzzles are the only system
Titan Chaser
Figuring out how to herd each titan is the task
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.