Thanks for all your input.
IMHO Shimano track hubs are in their own leage, as they have classical cup & cone bearings which are far superior to cartridge bearings. But Shimanos just come in old style 32 and 36 holes version like in the old days when we all had thin aluminum rims with tied and soldered spoke crossings (I started track cycling in the very early 80s as a kid at the famous Velodrom at Büttgen, Landesleistungszentrum NRW, Germany).
With todays stiff carbon rims, if you want to lace a 20/24 spokes wheelset, only option are new style track hubs.
Polso track hubs are about the same wheight as Novatec, Ridea and DT Swiss. Personally, I'm not a DT Swiss fan, as I don't think ratchet freehubs are an improvement over classic pawl freewheel, theirfore always prefere Novatec D411/D412 over DTS 350/240 hubs when building road or CX/gravel wheels.
A track hub is the most basic hub of all, CNC machined body and 2 bearings. With CNC beeing equally accurate no matter what brand, I wonder what reasons there could be to to not buy the low cost modell.
At least the Polso hubs seem to have a very nice finished surface, from the pics better than Novatec track.
Taking a set of Polso and changing bearings to high quality like SKF, I wonder why DT Swiss 370 track could be any better?