head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
A forgiving kids' shooter of matching mask powers to obvious obstacles.

Execution · Practiced Mastery
Charming physics toy about a wobbly robot climbing a giant plant into the sky.
Bionicle Heroes leans Execution (Practiced Mastery); Grow Home leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Bionicle Heroes
Lock-on shooting keeps physical demands low
Grow Home
Procedural hand-over-hand climbing coordination
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bionicle Heroes
Enemy robots run on simple scripts
Grow Home
No opposition of any kind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bionicle Heroes
Piece drops are plentiful and uniform
Grow Home
World fixed; little hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bionicle Heroes
Mask-power swapping maps obviously to obstacles
Grow Home
Vine routing toward floating islands
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.