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 · Competitive PvP
A wrestling game testing grapple/reversal timing and reading opponents in versus.

Execution · Competitive PvP
Reversal timing and pacing against an opponent baiting your counters.
Legends of Wrestling II leans Execution (Competitive PvP); WWE 2K15 leans Execution (Competitive PvP).
Legends of Wrestling II leans a little harder on execution, though the gap is small.
Legends of Wrestling II
Grapple timing and reversal windows are the lead skill
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.
Legends of Wrestling II
Human matches reward reading opponent grapple attempts
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.
Legends of Wrestling II
Minor randomness in move outcomes
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.
Legends of Wrestling II
Move chaining and stamina management 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.