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.

Reads · Mind & Math
A team airship battler testing crew coordination and outmaneuvering human captains.

Execution · Competitive PvP
Shot timing and play selection against opponents adjusting to your tendencies.
Guns of Icarus Online leans Reads (Mind & Math); NBA 2K14 leans Execution (Competitive PvP).
NBA 2K14 leans a little harder on execution, though the gap is small.
Guns of Icarus Online
Gunnery arcs and repair juggling need competent hands
NBA 2K14
Shot release timing and dribble chains gate scoring
Guns of Icarus Online leans a little harder on reads, though the gap is small.
Guns of Icarus Online
Human captains feint, reposition and counter your ship tactics
NBA 2K14
Online opponents counter your favourite plays
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Guns of Icarus Online
Cloud cover hides ships briefly, little else random
NBA 2K14
Shot RNG sways close possessions
Guns of Icarus Online leans a little harder on optimization, though the gap is small.
Guns of Icarus Online
Loadouts, role coordination and positioning are deeply plannable
NBA 2K14
Playbook knowledge and roster management 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.