head to head
Neither is simply harder - they are hard in different places. Eisei Meijin VI demands more reads; The Jackbox Party Pack 3 demands more variance.

Reads · Pure Mind Games
A Japanese shogi (Japanese chess) simulation game.

Reads · Bluff & Deduction
The pack with Trivia Murder Party and Fakin' It, built on out-guessing the room.
Eisei Meijin VI leans Reads (Pure Mind Games); The Jackbox Party Pack 3 leans Reads (Bluff & Deduction).
The Jackbox Party Pack 3 leans a little harder on execution, though the gap is small.
Eisei Meijin VI
no physical input skill, purely turn-based
The Jackbox Party Pack 3
Phones-as-controllers, near-zero dexterity.
Eisei Meijin VI leans clearly harder on reads.
Eisei Meijin VI
shogi opponents genuinely adapt to your play
The Jackbox Party Pack 3
Trivia Murder Party and Fakin' It reward reading the room.
The Jackbox Party Pack 3 leans clearly harder on variance.
Eisei Meijin VI
no hidden information or randomness at all
The Jackbox Party Pack 3
Random prompts and question draws.
Eisei Meijin VI leans clearly harder on optimization.
Eisei Meijin VI
deep opening/endgame theory to master
The Jackbox Party Pack 3
Light trivia and betting math.
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.