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 · Competitive PvP
A hero battle royale where teamwork and aim against human opponents decides fights.

Execution · Competitive PvP
A chaotic arena fighter built around item combos and stage interaction.
My Hero Ultra Rumble leans Execution (Competitive PvP); Power Stone 2 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.
My Hero Ultra Rumble
aim and combo timing in battles
Power Stone 2
fast combo execution and item usage
Power Stone 2 leans a little harder on reads, though the gap is small.
My Hero Ultra Rumble
predicting human opponent tactics
Power Stone 2
reading human opponents in free-for-all combat
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
Power Stone 2
item spawns and stage hazards random
My Hero Ultra Rumble leans a little harder on optimization, though the gap is small.
My Hero Ultra Rumble
team comps and loadouts solvable
Power Stone 2
item combination knowledge and stage control
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.