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

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

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Dead or Alive Xtreme Beach Volleyball leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Dead or Alive Xtreme Beach Volleyball
Volleyball rallies need timing but stay deliberately forgiving
Grand Theft Auto V
Driving and shooting demand decent inputs.
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
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
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
Grand Theft Auto V
Some mission and lobby randomness.
Grand Theft Auto V leans a little harder on optimization, though the gap is small.
Dead or Alive Xtreme Beach Volleyball
Managing partner relationships and money is the deeper loop
Grand Theft Auto V
Heists, money loops, builds 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.