My experience with TT's has been to use a Belt Drive in the earliest days of building a HiFi System.
For a Proportion of the 90's I used a Belt Drive TT.
From shortly before or shortly after the Millennium I started to use Idler Drive and it was the impression this TT was able to make, that got myself into learning about different ancillaries to be used with it.
I used this Idler Drive for 14 years and then changed it for a modern thought out approach to a Idler Drive, where I acquired a PTP Solid Nine > PTP Bearing and a Speed Controller.
Very shortly after this I was introduced to a Technics SP10 Mk II DD, where the TT belonged to an EE who had become very familiar with the TT and have their own Mod's to be used on it.
Various Idler Drives including my own and the DD was at a comparison day, and not one Idler Drive was able to impress me to the extent the DD was capable of.
I received a demonstration of the my Idler Drive and the DD are the home of the EE, where the outcome was that I signed the dotted line for the DD and Tonearm Purchase and have not looked back with any regret.
A Friend who is a long term Belt Drive owner/user, a short term Idler Drive owner /user, when hearing my TT, chose to go for the SP10 R > Glanz Tonearm to have the latest technology used in their system.
A similar story for another friend who is a long term Belt Drive user as well, following being demonstrated my DD TT and Tonearm, they purchased a identical set up.
Prior to my knowing these individuals through a local HiFi Club, they were both quite familiar with another members SME 20/12 > SME V, I have also through club participation become familiar with the SME TT.
The SME owner has now gone for a Idler Drive > Origin Live Illustrious in a lightweight Plinth Design, not adopting the usual Massey type.
When an individual becomes Wed to a performance offered by a TT, it looks like for some and probably many, they will follow their own instinct for what they feel is right for them.
Only the ears as the tool will enable the necessary information to be processed and allow the individual to confirm for themselves what is the most attractive to their unique preferences and a satisfactory assessment be carried out.
I do not see a description being the best method to be used to evaluate the differences to the sonic trait that each drive mechanism can produce.