Cheers!!!
As a very broad generalisation, Delano’s are more ‘hi-fi’ (not sterile though), Sandbergs more of a tilt towards vintage sounding but modern enough, Black labels - more punch to them, a real little jab to the guts (in a good way) and slightly higher output.
None of them are a bad option, the Black labels go very well with the Superlight basses, as the lightweight need a little more ‘mass‘.
The Sandbergs in my MarloweDK for me are perfect - fine on their own, enough poke to make any preamp/preamp pedal come alive but subtle enough to allow sound sculpting, as opposed to for example G&L MFD pick ups which are so powerful, they are difficult to tame, Black labels are not in this category.
Delano’s are their to allow you to sculpt also, but will always be a bit more modern sounding.
When I had my VS4 with Sandberg big pole pick up, passive, it was great, but wasn’t quite there - not sure if it was the pick up or the whole package, put it with the M pick up on a VM - different kettle of fish - great combination, really gives that clarity to allow the P biased sound to cut through, which is where it wins IMHO
Sorry I can’t be more specific, but hopefully it gives you a sonic territory to go with.