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

Optimization · Systems & Chaos
Solvable micro-tactics puzzles gated by gacha luck over unit ownership.

Optimization · Systems & Chaos
Kid-friendly MMO where wizard students duel with turn-based collectible spell cards.
Fire Emblem Heroes leans Optimization (Systems & Chaos); Wizard101 leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Heroes
Drag-and-drop tactics need no dexterity
Wizard101
Turn-based card combat needs no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Heroes
Arena defense teams are AI-run, so prediction is shallow
Wizard101
Ranked PvP adds modest human prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Heroes
Gacha summoning rolls gate which units you even own
Wizard101
Card draws and accuracy fizzles randomise duels
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Heroes
Skill inheritance, team building and tile math are deeply solvable
Wizard101
Deck building, school synergies and gear are 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.