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
A tennis simulation where timing execution and reading opponent tendencies drive competitive outcomes.

Execution · Competitive PvP
Shot timing and play-calling against opponents who scheme around your habits.
AO Tennis 2 leans Execution (Competitive PvP); NBA 2K16 leans Execution (Competitive PvP).
AO Tennis 2 leans a little harder on execution, though the gap is small.
AO Tennis 2
Ball timing and serve placement have clear skill ceilings
NBA 2K16
Shot-stick timing and dribble moves gate every possession
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
AO Tennis 2
Online human opponents create adaptive rally patterns
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.
AO Tennis 2
Very little luck in outcomes
NBA 2K16
Shot RNG and card packs add bounded randomness
NBA 2K16 leans a little harder on optimization, though the gap is small.
AO Tennis 2
Player builds and tactical shot variety are learnable systems
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.