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.

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

Variance · Systems & Chaos
Streamlined card battles where deck construction fights the coin flips.
Fire Emblem Heroes leans Optimization (Systems & Chaos); Pokémon Trading Card Game Pocket leans Variance (Systems & Chaos).
Fire Emblem Heroes leans a little harder on execution, though the gap is small.
Fire Emblem Heroes
Drag-and-drop tactics need no dexterity
Pokémon Trading Card Game Pocket
Tapping cards takes no skill
Pokémon Trading Card Game Pocket leans a little harder on reads, though the gap is small.
Fire Emblem Heroes
Arena defense teams are AI-run, so prediction is shallow
Pokémon Trading Card Game Pocket
Human opponents exist but the simplified format limits bluffing depth
Pokémon Trading Card Game Pocket leans a little harder on variance, though the gap is small.
Fire Emblem Heroes
Gacha summoning rolls gate which units you even own
Pokémon Trading Card Game Pocket
Coin flips, draws and pack pulls dominate single games
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
Pokémon Trading Card Game Pocket
Deckbuilding around a small card pool is quickly 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.