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 physics-driven football game testing tackle timing and play-calling.

Execution · Competitive PvP
Shot timing and play selection against opponents adjusting to your tendencies.
Backbreaker leans Execution (Practiced Mastery); NBA 2K14 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.
Backbreaker
Tackle timing and ball control via physics demand precision
NBA 2K14
Shot release timing and dribble chains gate scoring
NBA 2K14 leans a little harder on reads, though the gap is small.
Backbreaker
Human opponents add play-calling prediction; AI is scripted
NBA 2K14
Online opponents counter your favourite plays
Backbreaker leans a little harder on variance, though the gap is small.
Backbreaker
Physics-driven tackles add emergent unpredictability
NBA 2K14
Shot RNG sways close possessions
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Backbreaker
Playbook selection and field management decide drives
NBA 2K14
Playbook knowledge and roster management 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.