head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
Timing on the ball and outguessing the opposing player's tactics.

Execution · Competitive PvP
An anime arena fighter testing team-switch timing and counter prediction against humans.
FIFA Soccer 06 leans Execution (Competitive PvP); One Piece: Burning Blood leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 06
First-touch control and shot timing decide chances
One Piece: Burning Blood
Combo timing and guard breaks need moderate hands
One Piece: Burning Blood leans a little harder on reads, though the gap is small.
FIFA Soccer 06
Human opponents vary attack patterns and bait tackles
One Piece: Burning Blood
Human opponents bait switches and counters constantly
FIFA Soccer 06 leans a little harder on variance, though the gap is small.
FIFA Soccer 06
Bounces and keeper spills inject small randomness
One Piece: Burning Blood
Full-information arena with no hidden state
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 06
Squad selection and tactics reward preparation
One Piece: Burning Blood
Team composition and Devil Fruit matchups reward study
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.