Well, I have tried a lot of Sandberg basses, as I often went in Germany, and they sound very "modern", very punchy and clean.
The main difference I found between Bartolini pickups and Delano, BassCulture or Crel pickups is that the first ones have a very narrow spectrum : there are almost no sub-basses, mid-mids and ultra-high frequencies, whereas the others capture almost all these frequencies.
You can see it very clearely using a spectroscope : Bartolini's spectrum is like a "M" with basses and high frequencies, and the other ones include all the sound spectrum.
That's why the Barolini sound "warmer" to me, while the hand-made pickups with neodyme magnets sound "cleaner". They just sound the opposite, if you change just the pickup parameter on a bass (we have experienced it with Laurent Kah on one of his basses, between Bassculture and Bartolini P2) It depends of the sound you're looking for.
I personnaly think that a luthier that uses neodyme pickups is a good one because you just hear the sound of the woods ; you cannot cheat. There are some "guitar makers" that are not that good at all and that put "colouring" pickups and preamp that will hide the defects of the instrument.