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

Optimization · Practiced Mastery
A co-op looter shooter where aggressive ability builds and gear mods carry you through escalating expeditions.

Optimization · Practiced Mastery
Bethesda space RPG with ship and outpost systems.
Outriders leans Optimization (Practiced Mastery); Starfield 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.
Outriders
Cover shooting and ability timing matter
Starfield
Shooter and piloting inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Outriders
AI hordes are scripted aggression
Starfield
Scripted NPC AI patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Outriders
Loot rolls gate the build chase
Starfield
Procedural planets, loot variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Outriders
Class builds and mod stacking dominate endgame
Starfield
Ship building, outpost, perk routing
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.