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

Execution · Practiced Mastery
An arena fighter mixing combo execution, build grinding and human prediction online.

Execution · Competitive PvP
A rugby simulation testing input timing and tactical play against opponents.
Dragon Ball: Xenoverse leans Execution (Practiced Mastery); Rugby World Cup 2015 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.
Dragon Ball: Xenoverse
3D arena combos, vanishes and ki management need practiced hands
Rugby World Cup 2015
Timing passes, tackles, and kicks needs consistent inputs
Rugby World Cup 2015 leans a little harder on reads, though the gap is small.
Dragon Ball: Xenoverse
Online PvP rewards predicting human mixups; PvE is scripted
Rugby World Cup 2015
Human opponents can be read in multiplayer matches
Rugby World Cup 2015 leans a little harder on variance, though the gap is small.
Dragon Ball: Xenoverse
Skill drops from missions roll randomly
Rugby World Cup 2015
Ball bounces and AI add some unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball: Xenoverse
Build crafting and attribute allocation shape PvP viability
Rugby World Cup 2015
Set plays, team selection, and tactics form a systems layer
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.