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

Optimization · Practiced Mastery
Galaxy-spanning space sim about flight and trade.

Optimization · Pure Optimization
Optimizing race mechanics and vortex rituals while executing real-time battle tactics.
Elite Dangerous leans Optimization (Practiced Mastery); Total War: Warhammer II leans Optimization (Pure Optimization).
Elite Dangerous leans a little harder on execution, though the gap is small.
Elite Dangerous
Flight controls, docking, combat aim
Total War: Warhammer II
Unit micro, spell timing, and formation play drive battle outcomes
Total War: Warhammer II leans a little harder on reads, though the gap is small.
Elite Dangerous
Light PvP reads, mostly PvE
Total War: Warhammer II
Vortex campaign AI predictable; human opponents require genuine reads
Total War: Warhammer II leans a little harder on variance, though the gap is small.
Elite Dangerous
Procedural galaxy, mission variance
Total War: Warhammer II
Rite costs, random loot drops, and chaos invasion timing create variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Elite Dangerous
Ship build, trade routes, engineering grind
Total War: Warhammer II
Race mechanics and vortex ritual routing are richly optimizable
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.