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

Execution · Practiced Mastery
Stick execution and opponent prediction inside licensed tournament football.
NBA 2K14 leans Execution (Competitive PvP); UEFA Champions League 2006–2007 leans Execution (Practiced Mastery).
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
UEFA Champions League 2006–2007
Pass timing and shot placement decide most goals
NBA 2K14 leans a little harder on reads, though the gap is small.
NBA 2K14
Online opponents counter your favourite plays
UEFA Champions League 2006–2007
Human opponents bait tackles and disguise attacks
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K14
Shot RNG sways close possessions
UEFA Champions League 2006–2007
Deflections and AI bounces add match noise
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
UEFA Champions League 2006–2007
Squad selection and tactical setup are solvable preparation
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.