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
Wrestling-style timing duels with grapple prediction against human opponents.

Execution · Competitive PvP
Classic licensed football testing input control and opponent pattern reading.
Def Jam Vendetta leans Execution (Competitive PvP); FIFA Soccer 2005 leans Execution (Competitive PvP).
FIFA Soccer 2005 leans a little harder on execution, though the gap is small.
Def Jam Vendetta
Grapple timing and reversal windows demand sharp inputs
FIFA Soccer 2005
Off-the-ball control and finishing timing are mechanical skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Def Jam Vendetta
Human matches turn on predicting grapples versus strikes
FIFA Soccer 2005
Human opponents adjust attack patterns across a match
FIFA Soccer 2005 leans a little harder on variance, though the gap is small.
Def Jam Vendetta
Nothing hidden once movesets are learned
FIFA Soccer 2005
Bounces and keeper behaviour add minor chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Def Jam Vendetta
Character move pools and reversal systems are mappable
FIFA Soccer 2005
Formations and exploit plays of the era are learnable
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.