Hello:

booting off of an FFS partion seams to run smoother because the
filesystemtype "Apple_UNIX_SVR2" allows to specify aditional bits that
the kernel uses to determine the root partition.
(pdisk will ask you for these settings after changing the typ of the
partition to SVR2).

what happens if you leave the UFS-slice as it is but "label" it SVR2.
Will NetBSD just pick up the hints and determine the fs-type from some
magic bytes on the slice?
Or will MacOS complain because it got the relation between the
type-info and the fs-type on the slices hardcoded?

Can't test myself, because I use FFS. But would be curious to know ;-)

Rudi