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
Tests quick ball control and outguessing a human defender's tackles.

Execution · Competitive PvP
Shot timing and play selection against opponents adjusting to your tendencies.
International Superstar Soccer Deluxe leans Execution (Competitive PvP); 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.
International Superstar Soccer Deluxe
Pass and shot timing under pressure decide matches
NBA 2K14
Shot release timing and dribble chains gate scoring
International Superstar Soccer Deluxe leans a little harder on reads, though the gap is small.
International Superstar Soccer Deluxe
Versus a human, faking runs and reading tackles is central
NBA 2K14
Online opponents counter your favourite plays
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
International Superstar Soccer Deluxe
Deflections and keeper bounces add light chaos
NBA 2K14
Shot RNG sways close possessions
NBA 2K14 leans a little harder on optimization, though the gap is small.
International Superstar Soccer Deluxe
Formations and set-piece routines are learnable systems
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.