head to head
Neither is simply harder - they are hard in different places. Death Note: Killer Within demands more reads; Pokémon Battle Revolution demands more optimization.

Reads · Pure Mind Games
A social deduction game about deceiving and unmasking human players.

Reads · Mind & Math
Predicting a human trainer's switches atop team-building math and damage rolls.
Death Note: Killer Within leans Reads (Pure Mind Games); Pokémon Battle Revolution leans Reads (Mind & Math).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Death Note: Killer Within
Movement and tasks need no twitch skill
Pokémon Battle Revolution
Turn-based menu selection requires no dexterity
Death Note: Killer Within leans clearly harder on reads.
Death Note: Killer Within
Reading and deceiving human players is the social-deduction core
Pokémon Battle Revolution
Wi-Fi battles hinge on predicting switches and protects
Death Note: Killer Within leans a little harder on variance, though the gap is small.
Death Note: Killer Within
Hidden roles and identities are concealed information
Pokémon Battle Revolution
Damage rolls, crits and status procs sway turns
Pokémon Battle Revolution leans clearly harder on optimization.
Death Note: Killer Within
Task efficiency and voting logic offer some system play
Pokémon Battle Revolution
Team building and type-matchup math underpin every battle
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.