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 · Pure Mechanics
Motion-controlled racing where fighting the Kinect is half the physical test.

Execution · Pure Mechanics
Island-themed collection of twelve motion-controlled sports showcasing the Wii MotionPlus accessory.
Sonic Free Riders leans Execution (Pure Mechanics); Wii Sports Resort 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.
Sonic Free Riders
Full-body Kinect steering is a physical (if unreliable) motor test
Wii Sports Resort
MotionPlus precision in swordplay, archery and bowling
Wii Sports Resort leans a little harder on reads, though the gap is small.
Sonic Free Riders
Human races add slight item-timing prediction
Wii Sports Resort
Local versus duels involve mild feinting
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Free Riders
Item pickups inject kart-style randomness
Wii Sports Resort
Slight physics and CPU pattern randomness
Wii Sports Resort leans a little harder on optimization, though the gap is small.
Sonic Free Riders
Track shortcuts are shallow knowledge
Wii Sports Resort
Each event has small learnable technique optima
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.