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 hero battle royale where teamwork and aim against human opponents decides fights.

Execution · Competitive PvP
A rugby simulation testing input timing and tactical play against opponents.
My Hero Ultra Rumble leans Execution (Competitive PvP); Rugby World Cup 2015 leans Execution (Competitive PvP).
My Hero Ultra Rumble leans a little harder on execution, though the gap is small.
My Hero Ultra Rumble
aim and combo timing in battles
Rugby World Cup 2015
Timing passes, tackles, and kicks needs consistent inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
My Hero Ultra Rumble
predicting human opponent tactics
Rugby World Cup 2015
Human opponents can be read in multiplayer matches
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
My Hero Ultra Rumble
item and loot drops are random
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.
My Hero Ultra Rumble
team comps and loadouts solvable
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.