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 · Practiced Mastery
Aiming banked bubble shots quickly while planning chain clears.

Execution · Practiced Mastery
Sprawling action horror with four campaigns and a surprisingly deep combat system.
Bust-a-Move 4 leans Execution (Practiced Mastery); Resident Evil 6 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Bust-a-Move 4
Precise bubble aiming and bank shots under time pressure
Resident Evil 6
Deep melee-and-gunplay movement system rewards mechanics
Bust-a-Move 4 leans a little harder on reads, though the gap is small.
Bust-a-Move 4
Versus mode allows mild human pressure timing
Resident Evil 6
Agent Hunt PvP adds a sliver of prediction
Bust-a-Move 4 leans a little harder on variance, though the gap is small.
Bust-a-Move 4
Bubble colour feed is random but bounded
Resident Evil 6
Set-piece campaigns are fixed after first sight
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bust-a-Move 4
Clearing patterns and pulley setups have known solutions
Resident Evil 6
Skill builds and Mercenaries combos are 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.