head to head
The Witcher: Adventure Game asks more than Fire Emblem Heroes, and the gap is variance.

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

Variance · Systems & Chaos
A dice-and-cards board game testing quest routing against heavy draw luck.
Fire Emblem Heroes leans Optimization (Systems & Chaos); The Witcher: Adventure Game leans Variance (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
The Witcher: Adventure Game
Digital board game - clicks only
The Witcher: Adventure Game leans a little harder on reads, though the gap is small.
Fire Emblem Heroes
Arena defense teams are AI-run, so prediction is shallow
The Witcher: Adventure Game
Human rivals race and block, but interaction is shallow
The Witcher: Adventure Game leans clearly harder on variance.
Fire Emblem Heroes
Gacha summoning rolls gate which units you even own
The Witcher: Adventure Game
Dice combat and event card draws dominate single quests
Fire Emblem Heroes leans a little harder on optimization, though the gap is small.
Fire Emblem Heroes
Skill inheritance, team building and tile math are deeply solvable
The Witcher: Adventure Game
Quest routing and risk-odds management reward planning
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.