head to head
Wii Sports Resort asks more than Dead or Alive Xtreme Beach Volleyball, and the gap is execution.

Execution · Practiced Mastery
Light volleyball timing wrapped in a gift-economy vacation sim.

Execution · Pure Mechanics
Island-themed collection of twelve motion-controlled sports showcasing the Wii MotionPlus accessory.
Dead or Alive Xtreme Beach Volleyball leans Execution (Practiced Mastery); Wii Sports Resort leans Execution (Pure Mechanics).
Wii Sports Resort leans clearly harder on execution.
Dead or Alive Xtreme Beach Volleyball
Volleyball rallies need timing but stay deliberately forgiving
Wii Sports Resort
MotionPlus precision in swordplay, archery and bowling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead or Alive Xtreme Beach Volleyball
Versus humans adds light shot 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.
Dead or Alive Xtreme Beach Volleyball
Partner mood and gift systems behave semi-randomly
Wii Sports Resort
Slight physics and CPU pattern randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dead or Alive Xtreme Beach Volleyball
Managing partner relationships and money is the deeper loop
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.