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 · Competitive PvP
A rough anime fighter testing input timing and second-guessing a human opponent.

Execution · Competitive PvP
An anime arena fighter testing team-switch timing and counter prediction against humans.
Dragon Ball GT: Final Bout leans Execution (Competitive PvP); One Piece: Burning Blood leans Execution (Competitive PvP).
Dragon Ball GT: Final Bout leans a little harder on execution, though the gap is small.
Dragon Ball GT: Final Bout
Combo inputs and meteor-counter timing decide exchanges
One Piece: Burning Blood
Combo timing and guard breaks need moderate hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball GT: Final Bout
Human opponents bait and adapt in versus play
One Piece: Burning Blood
Human opponents bait switches and counters constantly
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball GT: Final Bout
Nothing hidden once movesets are known
One Piece: Burning Blood
Full-information arena with no hidden state
One Piece: Burning Blood leans a little harder on optimization, though the gap is small.
Dragon Ball GT: Final Bout
Small roster and shallow systems cap the study layer
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.