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 · Competitive PvP
Stick execution and reading human opponents within a meta-driven system.

Execution · Competitive PvP
An American football sim mixing stick execution with play-calling mind games versus opponents.
FIFA 18 leans Execution (Competitive PvP); NFL 2K3 leans Execution (Competitive PvP).
FIFA 18 leans a little harder on execution, though the gap is small.
FIFA 18
Perfect stick skill and timing dominate dribbles and finishing
NFL 2K3
Stick control of players demands timing and reaction
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 18
Human opponents bait, switch tactics and counter your habits
NFL 2K3
Play-calling against human opponents is constant prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 18
Bounce physics and pack luck add measured chaos
NFL 2K3
Fumbles and bounces inject randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 18
Formation, squad chemistry and meta mechanics reward study
NFL 2K3
Playbook knowledge and matchups reward 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.