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.

Execution · Practiced Mastery
A gritty WWII Call of Duty that introduced the Zombies mode.

Execution · Practiced Mastery
A competitive falling-blob puzzle testing fast chaining under speed pressure.
Call of Duty: World at War leans Execution (Practiced Mastery); Puyo Puyo Fever 2 leans Execution (Practiced Mastery).
Puyo Puyo Fever 2 leans a little harder on execution, though the gap is small.
Call of Duty: World at War
Twitch gunfights in fast multiplayer lobbies
Puyo Puyo Fever 2
Fast chaining under accelerating speed is the lead axis
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: World at War
Human opponents reward positioning prediction
Puyo Puyo Fever 2
Versus human play adds light prediction of attacks
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: World at War
Random lobbies, spawns, and zombie waves
Puyo Puyo Fever 2
Piece colors random but quickly mapped
Puyo Puyo Fever 2 leans a little harder on optimization, though the gap is small.
Call of Duty: World at War
Perk loadouts and map control are learnable
Puyo Puyo Fever 2
Chain patterns have known optimal building techniques
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.