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
An arcade soccer game testing ball control and prediction against opponents.

Execution · Competitive PvP
A hero battle royale where teamwork and aim against human opponents decides fights.
International Superstar Soccer 2 leans Execution (Competitive PvP); My Hero Ultra Rumble leans Execution (Competitive PvP).
My Hero Ultra Rumble leans a little harder on execution, though the gap is small.
International Superstar Soccer 2
Passing, shooting and dribbling timing decides plays
My Hero Ultra Rumble
aim and combo timing in battles
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
International Superstar Soccer 2
Human opponents juke and feint, demanding prediction
My Hero Ultra Rumble
predicting human opponent tactics
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
International Superstar Soccer 2
Ball physics and deflections add some chaos
My Hero Ultra Rumble
item and loot drops are random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
International Superstar Soccer 2
Formations, tactics and build-up play matter underneath
My Hero Ultra Rumble
team comps and loadouts solvable
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.