Comparing 2 boards

These two are a long way apart on volume, so they are not really alternatives to each other.

Roberts Surfboards DIRTY BIRD

DIRTY BIRD

Roberts Surfboards

Length
5'6"–6'8"
Volume
Shape
shortboard
Fin setup
Thruster
Video
Big Sun PERFORMANCE PARALLELOGRAM

PERFORMANCE PARALLELOGRAM

Big Sun

Length
5'6"–6'4"
Volume
Shape
shortboard
Fin setup
Twin/quad
Video
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Up to 4 boards at a time. Volume and length are the shaper's published ranges across all sizes of the model, not a single board.