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
Shot timing and play selection against opponents adjusting to your tendencies.

Execution · Competitive PvP
An arcade street football game balancing input timing with opponent reads.
NBA 2K14 leans Execution (Competitive PvP); NFL Street 3 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.
NBA 2K14
Shot release timing and dribble chains gate scoring
NFL Street 3
Timing trick moves, passes and tackles demands control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K14
Online opponents counter your favourite plays
NFL Street 3
Human opponents require reading play calls and movement
NFL Street 3 leans a little harder on variance, though the gap is small.
NBA 2K14
Shot RNG sways close possessions
NFL Street 3
Physics and catch outcomes add randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K14
Playbook knowledge and roster management reward study
NFL Street 3
Team building, style points and play strategy run underneath
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.