head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Competitive PvP
A soccer simulation testing ball-control execution and reading human opponents.

Execution · Competitive PvP
Shot timing and play-calling against opponents who scheme around your habits.
FIFA 06: Road to FIFA World Cup leans Execution (Competitive PvP); NBA 2K16 leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 06: Road to FIFA World Cup
Passing, shooting and movement timing decide matches
NBA 2K16
Shot-stick timing and dribble moves gate every possession
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 06: Road to FIFA World Cup
Human opponents can be read; AI is scripted
NBA 2K16
Online opponents adjust defensive schemes against your tendencies
FIFA 06: Road to FIFA World Cup leans a little harder on variance, though the gap is small.
FIFA 06: Road to FIFA World Cup
Some randomness in ball physics and outcomes
NBA 2K16
Shot RNG and card packs add bounded randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 06: Road to FIFA World Cup
Formations, tactics and player management matter
NBA 2K16
Playbooks, rotations and roster building reward deep study
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.