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
An MMO where bar-swap rotations and set-build optimization carry endgame.

Optimization · Practiced Mastery
Planning a raid in advance, then executing it where one mistake kills.
The Elder Scrolls Online leans Optimization (Practiced Mastery); Tom Clancy's Rainbow Six leans Optimization (Practiced Mastery).
Tom Clancy's Rainbow Six leans a little harder on execution, though the gap is small.
The Elder Scrolls Online
Action combat with weaving and rotations
Tom Clancy's Rainbow Six
One bullet kills, so entries demand clean aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls Online
Cyrodiil PvP adds modest reads layer
Tom Clancy's Rainbow Six
Multiplayer raids add human counterplay
Tom Clancy's Rainbow Six leans a little harder on variance, though the gap is small.
The Elder Scrolls Online
Loot tables and set drops
Tom Clancy's Rainbow Six
Terrorist placements are unknown until doors open
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Elder Scrolls Online
Rotations, sets, and build theorycraft central
Tom Clancy's Rainbow Six
The pre-mission planning phase is the real game
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.