head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Competitive PvP
Shot timing and play-calling against opponents who scheme around your habits.

Execution · Competitive PvP
Tests stick skills and constant prediction of a human opponent's attacking intent.
NBA 2K16 leans Execution (Competitive PvP); World Soccer Winning Eleven 6: Final Evolution leans Execution (Competitive PvP).
World Soccer Winning Eleven 6: Final Evolution leans a little harder on execution, though the gap is small.
NBA 2K16
Shot-stick timing and dribble moves gate every possession
World Soccer Winning Eleven 6: Final Evolution
First-touch timing, through-balls and finishing are mechanical skill
World Soccer Winning Eleven 6: Final Evolution leans a little harder on reads, though the gap is small.
NBA 2K16
Online opponents adjust defensive schemes against your tendencies
World Soccer Winning Eleven 6: Final Evolution
Human opponents constantly disguise attacks and adjust defending
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K16
Shot RNG and card packs add bounded randomness
World Soccer Winning Eleven 6: Final Evolution
Deflections and keeper bounces add minor chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K16
Playbooks, rotations and roster building reward deep study
World Soccer Winning Eleven 6: Final Evolution
Formations, Master League squad building reward system knowledge
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.