Both are very nice cartridges and share some sonic similarity - but the A90 is heads and shoulders better in all aspects - dynamics - sound staging - tonal palette. The Cadenza Black is one of my go to cartridges for everyday use - demos etc and it never lets me down. The A90 is one of my all time favorites - as with almost any Ortofon cartridge neutral sound i.e. No coloration is the main trait of both.
Good Listening
Peter
Good Listening
Peter