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.

Execution · Competitive PvP
A class-based objective shooter remembered for its parkour movement and rocky launch.

Execution · Pure Mechanics
A PS4-era Killzone where a Shadow Marshal and his OWL drone fight through a divided Helghast city.
Brink leans Execution (Competitive PvP); Killzone Shadow Fall leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Brink
SMART parkour and gunfights demand FPS mechanics
Killzone Shadow Fall
Standard FPS aim and movement ceiling
Brink leans a little harder on reads, though the gap is small.
Brink
Human teams contest objectives and flank routes
Killzone Shadow Fall
PvP modes reward predicting human players
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Brink
Spawn and objective chaos adds noise
Killzone Shadow Fall
Some open level routes and spawn noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Brink
Class loadouts and objective timing are learnable
Killzone Shadow Fall
OWL drone usage and loadouts optimize cleanly
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.