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 · Practiced Mastery
The original 2003 WWII shooter built around cinematic squad set pieces.

Execution · Practiced Mastery
A basketball simulation offering realistic team management and on-court play.
Call of Duty leans Execution (Practiced Mastery); NBA 08 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty
Aim and reaction carry the scripted firefights
NBA 08
shooting, dribbling, and defensive timing skill
NBA 08 leans a little harder on reads, though the gap is small.
Call of Duty
Light multiplayer prediction; campaign AI is scripted
NBA 08
human opponents require play prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty
Some spawn and hit unpredictability
NBA 08
shot variance and minor randomness
NBA 08 leans a little harder on optimization, though the gap is small.
Call of Duty
Memorising set pieces and weapon positions
NBA 08
team management and playbook strategy
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.