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
A strategy-arcade hybrid mixing map planning with twitchy battle control.

Execution · Competitive PvP
Reversal timing and pacing against an opponent baiting your counters.
North & South leans Execution (Practiced Mastery); WWE 2K15 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.
North & South
Arcade battle segments demand real-time unit control
WWE 2K15
Reversal timing windows decide most exchanges
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
North & South
Versus a friend, anticipating map moves and assaults matters
WWE 2K15
Human opponents bait reversals and vary move timing
North & South leans a little harder on variance, though the gap is small.
North & South
Random events like storms and raids disrupt plans
WWE 2K15
Chain-wrestling rock-paper-scissors minigames add randomness
North & South leans a little harder on optimization, though the gap is small.
North & South
Strategic-layer army positioning and economy reward planning
WWE 2K15
Move sets, stamina and match pacing are learnable systems
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.