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
A retro gridiron sim mixing input timing with play-call guessing against an opponent.

Execution · Competitive PvP
Shot timing and play-calling against opponents who scheme around your habits.
ABC Monday Night Football leans Execution (Practiced Mastery); 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.
ABC Monday Night Football
Timing passes, jukes and tackles demands controller precision
NBA 2K16
Shot-stick timing and dribble moves gate every possession
NBA 2K16 leans a little harder on reads, though the gap is small.
ABC Monday Night Football
Two-player matches involve guessing the human's play call
NBA 2K16
Online opponents adjust defensive schemes against your tendencies
ABC Monday Night Football leans a little harder on variance, though the gap is small.
ABC Monday Night Football
Fumble and catch rolls add bounded football randomness
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.
ABC Monday Night Football
Play-calling and roster knowledge form a solvable layer
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.