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

Execution · Pure Mechanics
Famously unforgiving ball control tested against human prediction in fast matches.

Execution · Pure Mechanics
Momentum-perfect platform racing spiced with item mind games against humans.
Kick Off 2 leans Execution (Pure Mechanics); SpeedRunners leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Kick Off 2
The ball never sticks - constant trapping demands famously precise control
SpeedRunners
Grapple swings and boost timing at full speed decide races
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kick Off 2
Human matches reward predicting passes and tackle timing
SpeedRunners
Timing item throws against human racers' habits wins exchanges
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kick Off 2
Pitch types and deflections add mild chaos
SpeedRunners
Item pickups add party-game chaos
SpeedRunners leans a little harder on optimization, though the gap is small.
Kick Off 2
Set plays and formation knowledge sit underneath
SpeedRunners
Optimal racing lines per track 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.