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
An arena fighter mixing combo execution, build grinding and human prediction online.

Execution · Competitive PvP
Timing-based reversals and grapple prediction inside a wrestling simulation.
Dragon Ball: Xenoverse leans Execution (Practiced Mastery); WWE 2K18 leans Execution (Competitive PvP).
Dragon Ball: Xenoverse leans a little harder on execution, though the gap is small.
Dragon Ball: Xenoverse
3D arena combos, vanishes and ki management need practiced hands
WWE 2K18
Reversal timing and combo inputs decide exchanges
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Xenoverse
Online PvP rewards predicting human mixups; PvE is scripted
WWE 2K18
Human matches turn on predicting grapple and reversal habits
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Xenoverse
Skill drops from missions roll randomly
WWE 2K18
Momentum and AI quirks add mild noise
Dragon Ball: Xenoverse leans a little harder on optimization, though the gap is small.
Dragon Ball: Xenoverse
Build crafting and attribute allocation shape PvP viability
WWE 2K18
Move-set knowledge and stamina management underpin wins
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.