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
Football stick execution and opponent reading, salted with bounce-of-the-ball luck.

Execution · Competitive PvP
Tests shot timing and faking out human defenders amid item-driven chaos.
FIFA Soccer 07 leans Execution (Competitive PvP); Mario Strikers Charged 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 07
Stick skills and timing on passes and finishing
Mario Strikers Charged
Timing tackles, charged shots and goalie deflections needs quick hands
Mario Strikers Charged leans a little harder on reads, though the gap is small.
FIFA Soccer 07
Versus humans, baiting tackles and disguising attacks matters
Mario Strikers Charged
Versus humans, faking shots and baiting tackles drives goals
Mario Strikers Charged leans a little harder on variance, though the gap is small.
FIFA Soccer 07
Deflections and keeper randomness swing single matches
Mario Strikers Charged
Items and stage hazards inject swingy chaos into matches
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 07
Formations and exploit patterns are learnable meta
Mario Strikers Charged
Captain abilities and team builds reward knowing the systems
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.