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
WWII team shooter blending aim and squad tactics.

Execution · Pure Mechanics
Trilogy capstone whose equal-start arena multiplayer defined a console generation.
Battlefield V leans Execution (Competitive PvP); Halo 3 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.
Battlefield V
Bullet drop and recoil punish sloppy aim
Halo 3
Precision aim and grenade-melee timing
Battlefield V leans a little harder on reads, though the gap is small.
Battlefield V
Flanks and squad play reward map sense
Halo 3
Equal-start fights reward predicting humans
Battlefield V leans a little harder on variance, though the gap is small.
Battlefield V
Vehicle spawns and chaos create swings
Halo 3
Equipment pickups and spawn variation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield V
Class loadouts and fortifications optimize holds
Halo 3
Power-weapon timers and map control
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.