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.

Optimization · Pure Optimization
Instanced online RPG where deck-like eight-skill builds decide battles before they begin.

Optimization · Mind & Math
A siege-war MMORPG defined by clan politics, PvP reads under castle warfare, and deep class optimisation.
Guild Wars leans Optimization (Pure Optimization); Lineage 2 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.
Guild Wars
Interrupt timing and kiting in skirmishes
Lineage 2
Auto-attack systems limit individual twitch expression
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Guild Wars
GvG and arena metagame against adapting humans
Lineage 2
Castle sieges and clan PvP demand reading opponent strategies
Lineage 2 leans a little harder on variance, though the gap is small.
Guild Wars
Modest drop and spawn randomness
Lineage 2
Drop rates and spoil variance are historically brutal
Guild Wars leans a little harder on optimization, though the gap is small.
Guild Wars
Eight-skill build construction is the game's soul
Lineage 2
Class synergies and party compositions for sieges are well-studied
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.