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 basketball sim testing shot timing and reading opponents with season management.

Execution · Competitive PvP
Shot timing and play-calling against opponents who scheme around your habits.
Kobe Bryant in NBA Courtside leans Execution (Practiced Mastery); NBA 2K16 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.
Kobe Bryant in NBA Courtside
Shot timing and ball control are the core skill
NBA 2K16
Shot-stick timing and dribble moves gate every possession
NBA 2K16 leans a little harder on reads, though the gap is small.
Kobe Bryant in NBA Courtside
Human matches reward reading the defender
NBA 2K16
Online opponents adjust defensive schemes against your tendencies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kobe Bryant in NBA Courtside
Minor randomness in shot outcomes
NBA 2K16
Shot RNG and card packs add bounded randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kobe Bryant in NBA Courtside
Roster moves and season strategy reward planning
NBA 2K16
Playbooks, rotations and roster building reward deep 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.