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 · Competitive PvP
Tests shot timing and play-calling prediction against human defenders.

Execution · Competitive PvP
Large-battle aim and positioning with light prediction against human players.
NBA 2K15 leans Execution (Competitive PvP); Star Wars: Battlefront II 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 2K15
Shot-stick timing and dribble moves demand practiced hands
Star Wars: Battlefront II
Aimbot dominates infantry fights and starfighter dogfights
NBA 2K15 leans a little harder on reads, though the gap is small.
NBA 2K15
Versus humans, baiting defenders and calling counters drives possessions
Star Wars: Battlefront II
Human opponents in multiplayer create modest prediction play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
NBA 2K15
Shot RNG and loose balls swing close games
Star Wars: Battlefront II
Spawns, vehicle availability and hero pickups add chaos
NBA 2K15 leans a little harder on optimization, though the gap is small.
NBA 2K15
Playbooks, matchups and roster management reward system study
Star Wars: Battlefront II
Class choice and map control reward learned plans
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.