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 · Grand Arena
Acclaimed basketball sim where playcalling and matchup reads decide online games.

Execution · Competitive PvP
Shot timing and play-calling against opponents who scheme around your habits.
NBA 2K11 leans Execution (Grand Arena); 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.
NBA 2K11
Shot-stick timing and dribble moves
NBA 2K16
Shot-stick timing and dribble moves gate every possession
NBA 2K11 leans a little harder on reads, though the gap is small.
NBA 2K11
Human defenders bait and adapt possession to possession
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.
NBA 2K11
Shooting rolls add mild noise
NBA 2K16
Shot RNG and card packs add bounded randomness
NBA 2K11 leans a little harder on optimization, though the gap is small.
NBA 2K11
Playbooks, matchup exploits, and roster knowledge
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.