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

Optimization · Practiced Mastery
An MMO where bar-swap rotations and set-build optimization carry endgame.
Guild Wars 2 leans Optimization (Practiced Mastery); The Elder Scrolls Online leans Optimization (Practiced Mastery).
Guild Wars 2 leans a little harder on execution, though the gap is small.
Guild Wars 2
Dodge timing and active combat define moment-to-moment play
The Elder Scrolls Online
Action combat with weaving and rotations
Guild Wars 2 leans a little harder on reads, though the gap is small.
Guild Wars 2
WvW and structured PvP feature real adaptive opponents
The Elder Scrolls Online
Cyrodiil PvP adds modest reads layer
Guild Wars 2 leans a little harder on variance, though the gap is small.
Guild Wars 2
Loot RNG is present but secondary to skill expression
The Elder Scrolls Online
Loot tables and set drops
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
The Elder Scrolls Online
Rotations, sets, and build theorycraft central
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.