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
A gritty WWII Call of Duty that introduced the Zombies mode.
Battlefield: Bad Company leans Execution (Practiced Mastery); Call of Duty: World at War leans Execution (Practiced Mastery).
Call of Duty: World at War leans a little harder on execution, though the gap is small.
Battlefield: Bad Company
Vehicle and infantry gunskill across big maps
Call of Duty: World at War
Twitch gunfights in fast multiplayer lobbies
Battlefield: Bad Company leans a little harder on reads, though the gap is small.
Battlefield: Bad Company
Predicting human squad pushes on objectives
Call of Duty: World at War
Human opponents reward positioning prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield: Bad Company
Destruction and large lobbies create chaos
Call of Duty: World at War
Random lobbies, spawns, and zombie waves
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
Call of Duty: World at War
Perk loadouts and map control are learnable
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.