Multiple TTs are great just because there are so many to love. But on a practical note, the ability to support multiple arms with different cartridges is a huge benefit. Rather that choosing on a track basis, I've found each record has a recorded personality that often favors one arm/cart combo over another.(...)
Sure - and this happens with DACs, amplifiers and even speakers ...
I have CDs that I clearly prefer with the DCS Vivaldi - for example, most Aliavox Jordi Savall recordings, and others I prefer with the Metronome Calypso / C2A, such as the Gershwin by Grofe or some Joseph Pons de Falla music from Harmonia Mundi.
The same for Lamm ML3 or VTL 750s - there is no best for all recordings. It is our musical and equipment preferences that dictate what we consider the "best".