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
Island-themed collection of twelve motion-controlled sports showcasing the Wii MotionPlus accessory.

Execution · Pure Mechanics
Grapple-timing execution and mashing stamina in arcade wrestling matches.
Wii Sports Resort leans Execution (Pure Mechanics); WWF Royal Rumble 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.
Wii Sports Resort
MotionPlus precision in swordplay, archery and bowling
WWF Royal Rumble
Grapple timing and button mashing decide every lock-up
WWF Royal Rumble leans a little harder on reads, though the gap is small.
Wii Sports Resort
Local versus duels involve mild feinting
WWF Royal Rumble
Human opponents add some habit prediction in versus
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Wii Sports Resort
Slight physics and CPU pattern randomness
WWF Royal Rumble
Little is hidden beyond grapple outcome wobble
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Wii Sports Resort
Each event has small learnable technique optima
WWF Royal Rumble
Move utility knowledge is a shallow solvable layer
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.