vtkFlyingEdges3D Usage. (Comparison with vtkContourfilter)

From what I understand, vtkContourFilter uses marching cube.

Hardware: iMac (3.5GHz, 8-Core, Intel Core i9)
OS: macOS 10.15.6 (Catalina)

For both cases of (vtkContourFilter & vtkFlyingEdges3D)


Input image (dimension): 180 x 256 x 256
Input image (Scalar type): int16_t

note: I filter the poly data through a stripper as a last step, this might explain why the cells are 0 (as I only work with strips). The result of the final output poly data is as follows

Output info - vtkContourFilter


number of cells - 0
number of strips - 71390
number of points - 211880

Output info - vtkFlyingEdges3D


number of cells - 0
number of strips - 72966
number of points - 217790

Can you make any sense of this?