In the next update, you'll be able to mix Marching Cubes and the classic mesh option together in one model by setting overrides per voxel group! This should allow for even more detail and uniqueness in your models.

As an example, the bench in the image below is set to use the classic mesh type, but the cushion and back are each grouped and configured to use Marching Cubes as an override for their mesh type.

For the bed shown below, it's set to use Marching Cubes (with the pillow, blanket, headboard, and footboard each in their own group), but the posts and bottom are configured to use the classic type as an override.