head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Execution · Practiced Mastery
Stick execution and opponent prediction over a franchise-management layer.

Execution · Competitive PvP
Accessible large-scale shooting with light prediction against human players.
NHL 2K6 leans Execution (Practiced Mastery); Star Wars Battlefront 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.
NHL 2K6
Shot timing, dekes and poke checks decide possessions
Star Wars Battlefront
Aimbot dominates blaster fights despite generous hitboxes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
NHL 2K6
Human opponents disguise plays and bait pulls online
Star Wars Battlefront
Human lobbies add modest positional prediction
Star Wars Battlefront leans a little harder on variance, though the gap is small.
NHL 2K6
Rebounds and deflections add per-game noise
Star Wars Battlefront
Power-up pickups and spawn flow inject chaos
NHL 2K6 leans a little harder on optimization, though the gap is small.
NHL 2K6
Line management and franchise decisions reward planning
Star Wars Battlefront
Objective timing and pickup control reward learned routes
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.