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

Optimization · Pure Optimization
A dinosaur survival game about taming, building, and tribal warfare on a hostile island.

Optimization · Mind & Math
The pioneering sandbox MMORPG of player economies, housing, and open PvP.
ARK: Survival Evolved leans Optimization (Pure Optimization); Ultima Online leans Optimization (Mind & Math).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
ARK: Survival Evolved
Shooting and kiting matter in raids
Ultima Online
PvP timing and macro dexterity matter
Ultima Online leans a little harder on reads, though the gap is small.
ARK: Survival Evolved
Tribe warfare involves human deception and politics
Ultima Online
Player killers and traders adapt to you
ARK: Survival Evolved leans a little harder on variance, though the gap is small.
ARK: Survival Evolved
Taming rolls, spawns, and surprise raids
Ultima Online
Open-world encounters and loot uncertainty
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
ARK: Survival Evolved
Breeding lines, base design, and farming dominate
Ultima Online
Skill builds and the player economy reward system mastery
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.