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 · Practiced Mastery
Fast top-down hockey execution with light roster management underneath.

Execution · Competitive PvP
Reversal timing and pacing against an opponent baiting your counters.
NHL 95 leans Execution (Practiced Mastery); WWE 2K15 leans Execution (Competitive PvP).
NHL 95 leans a little harder on execution, though the gap is small.
NHL 95
Top-down stickhandling and shot timing lead the test
WWE 2K15
Reversal timing windows decide most exchanges
WWE 2K15 leans a little harder on reads, though the gap is small.
NHL 95
Versus play rewards predicting a human defender's commitments
WWE 2K15
Human opponents bait reversals and vary move timing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
NHL 95
Bounces and AI goalies add mild noise
WWE 2K15
Chain-wrestling rock-paper-scissors minigames add randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
NHL 95
Line management and season trades reward roster 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.