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 · Practiced Mastery
Active dodge-heavy combat with a deep build system, tested against both scripted content and human opponents.

Optimization · Practiced Mastery
Classic RTS that polished Warcraft's formula with naval combat, air units and beloved multiplayer.
Guild Wars 2 leans Optimization (Practiced Mastery); Warcraft II: Tides of Darkness 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.
Guild Wars 2
Dodge timing and active combat define moment-to-moment play
Warcraft II: Tides of Darkness
Faster micro across land, sea and air units
Warcraft II: Tides of Darkness leans a little harder on reads, though the gap is small.
Guild Wars 2
WvW and structured PvP feature real adaptive opponents
Warcraft II: Tides of Darkness
Multiplayer scouting wars and build feints
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Guild Wars 2
Loot RNG is present but secondary to skill expression
Warcraft II: Tides of Darkness
Fog of war conceals enemy tech and armies
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Guild Wars 2
Build crafting and rotation theory-crafting reward deep analysis
Warcraft II: Tides of Darkness
Refined build orders and upgrade timings are studyable
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.