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
Stick precision and constant prediction of a human opponent's tactical habits.
NBA 2K16 leans Execution (Competitive PvP); Pro Evolution Soccer 2015 leans Execution (Competitive PvP).
Pro Evolution Soccer 2015 leans a little harder on execution, though the gap is small.
NBA 2K16
Shot-stick timing and dribble moves gate every possession
Pro Evolution Soccer 2015
First touch, through-ball timing and finishing demand precise sticks
Pro Evolution Soccer 2015 leans a little harder on reads, though the gap is small.
NBA 2K16
Online opponents adjust defensive schemes against your tendencies
Pro Evolution Soccer 2015
Human opponents bait, switch tactics and punish habits
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
Pro Evolution Soccer 2015
Deflections and referee calls add bounded 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
Pro Evolution Soccer 2015
Formations, player roles and set pieces 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.