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.

Execution · Competitive PvP
Large-scale shooter execution amid chaos, predicting human squads across evolving battlefields.

Execution · Pure Mechanics
Pure aim and movement skill tested against adaptive human opponents competing for spawn-cycle dominance.
Battlefield 6 leans Execution (Competitive PvP); Quake III Arena leans Execution (Pure Mechanics).
Quake III Arena leans a little harder on execution, though the gap is small.
Battlefield 6
Gunskill, movement and vehicle handling lead at every level
Quake III Arena
Rail and rocket aim at speed is the entire game
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 6
64-plus humans adapt positioning and pushes constantly
Quake III Arena
Human opponents adapt their routes and timings in direct response
Battlefield 6 leans a little harder on variance, though the gap is small.
Battlefield 6
Destruction, spawns and chaotic battles inject randomness
Quake III Arena
Spawn locations have mild randomness but are quickly mapped
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 6
Loadouts, squad roles and objective timing sit underneath
Quake III Arena
Armor and weapon timing routes are learnable and highly leveraged
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.