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 · Practiced Mastery
A destruction-driven military shooter where squads level buildings around objectives.

Execution · Practiced Mastery
Prequel chronicling Noble Team's doomed defence, with armour abilities reshaping multiplayer.
Battlefield: Bad Company leans Execution (Practiced Mastery); Halo: Reach leans Execution (Practiced Mastery).
Halo: Reach leans a little harder on execution, though the gap is small.
Battlefield: Bad Company
Vehicle and infantry gunskill across big maps
Halo: Reach
DMR precision and armour-ability timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield: Bad Company
Predicting human squad pushes on objectives
Halo: Reach
Multiplayer rewards predicting human movement
Battlefield: Bad Company leans a little harder on variance, though the gap is small.
Battlefield: Bad Company
Destruction and large lobbies create chaos
Halo: Reach
Loadouts and spawns add small swings
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield: Bad Company
Class roles and objective flow are learnable
Halo: Reach
Ability matchups and map knowledge
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.