head to head
Neither is simply harder - they are hard in different places. Bust-A-Move Universe demands more execution; Grand Theft Auto V demands more reads.

Execution · Practiced Mastery
A bubble-matching puzzle testing aim and chain planning under random bubble draws.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Bust-A-Move Universe leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Bust-A-Move Universe leans clearly harder on execution.
Bust-A-Move Universe
Aiming bubble shots quickly under rising pressure
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Bust-A-Move Universe
Solo puzzle, no opponent to predict
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Bust-A-Move Universe leans clearly harder on variance.
Bust-A-Move Universe
Next bubble colors are randomized
Grand Theft Auto V
Some mission and lobby randomness.
Bust-A-Move Universe leans clearly harder on optimization.
Bust-A-Move Universe
Bank-shot planning and chain setups reward strategy
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.