Rotating Carts

Not sure how much real difference that would make. I have a dozen MC carts and use primarily my favorite; seldom rotate other carts in and out. 

I wanted and finally got complete flexibility with 3 arms, all removable headshells. The more flexibility, the easier it is to listen to my small collection, and have friends bring their cartridges, and my spinner maintains speed even if all 3 arms are in the grooves, so comparing in seconds is just a matter of rotating the selector A,B,C on my SUT, 

latest, 3 removable headshells

prior, only 1 removable headshell

For me, the ease of change is far more important than the 'idea' of fixed or longer being better.

You need one of those wristwatch rotators. 

I rotate to keep my Carts near the same hours.

I spent a few years running multiple cartridges on tonearms with removable headshells. On my Scheu table I had two Dynavector DV505 arms that could be run into the same phono stage, and easily compare cartridges. That whole gig become less appealing over time. Eventually I decided I wanted the best analog i could afford, and sold my arms and cut down my cartridge collection to 3 pieces. 

I sold my SME V that was on my Sota Cosmos Eclipse, I sold both the Dynavectors, and a Scheu CB-1L I owned. I bought an Origin Live Eclipse for the Sota. The Schue got a 12" Audiomods Series 6 arm, and another Audiomods 10.5" Series 6 arm. 

After evaluating cartridges I kept a Transfiguration Audio Proteus and a OG Kiseki Blackheart. I bought a Benz Micro Glider H2 to go into the onboard phono stage of the Trinnov preamp I use. 

The Kiseki and Transfiguration sound lovely, and I could live with either cartridge as my only one. They do sound a bit different, but if you listen a bit the ear adjusts and both sound "right". The Glider sounds good, its my casual player, but the phono stage limits it, and I sometimes wonder why i even have it set up. 

The reality is my digital playback is very close to the Glider set up. I listen to digital on weekdays before work, and before bed. Vinyl usually gets played on the weekend. With so little playing time, why have so much invested in analog? I don't have a good answer for that. But at this time I am pretty content with the pieces I do have, and have no interest in rotating through a horde of cartridges, especially ones that are significantly limited in one facet or another.