head to head
vs
Bust a GroovevsMetal: Hellsinger
Bust a Groove leans Execution (Pure Mechanics); Metal: Hellsinger leans Execution (Pure Mechanics).
Bust a GrooveMetal: Hellsinger
Axis by axis
Execution7 vs 8
Metal: Hellsinger leans harder on execution: shooting on the beat is the entire skill test
Reads2 vs 0
Bust a Groove leans harder on reads: Attack timing against the rival adds light prediction
Variance1 vs 1
Even - both lean on variance about the same.
Optimization4 vs 5
Metal: Hellsinger leans harder on optimization: weapon choice and streak management for scores
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.