head to head
FIFA Street asks more than Sports Champions 2, and the gap is reads.

Execution · Competitive PvP
On-the-ball flair and one-on-one deception in small-sided street matches.

Execution · Pure Mechanics
Testing how precisely you can swing a Move controller across six sports.
FIFA Street leans Execution (Competitive PvP); Sports Champions 2 leans Execution (Pure Mechanics).
Sports Champions 2 leans a little harder on execution, though the gap is small.
FIFA Street
Flair moves and trick timing decide 4-on-4 duels
Sports Champions 2
Motion-controlled swings and punches reward physical precision
FIFA Street leans clearly harder on reads.
FIFA Street
Beating a human marker is feint-versus-anticipation
Sports Champions 2
Local rivals can be baited in boxing or tennis, lightly
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Street
Compact courts keep outcomes deterministic
Sports Champions 2
Events are deterministic given your motion
FIFA Street leans a little harder on optimization, though the gap is small.
FIFA Street
Reputation grind and team building are light systems
Sports Champions 2
Technique tips exist but systems stay shallow
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.