I don't have a experience with a extensive range of Cart's.
I have owned approx' 10 Cart's from MM, Ceramic, LOMC and HOMC, and am familiar with Three Cart's used regularly on my system, the main one in use being an Ortofon Rebuild, the lesser used ones being a low usage hours Ortofon Kontrapunkt b and a low usage hours Hana SL.
I am not too impressed with the Hana SL, it does not present in a manner that captures my real interest, but it is a reasonable Cart' for the asking price.
I have been quite impressed by the reintroduction and use of a Audio Technica AT-150MLX, this might be a place where I end up in the not too distant future.
I have heard the Len Gregory Moving Iron in the past when I was accumulating experiences of Cart's and was not too taken to this design in the system it was demonstrated in. I believe the Len Gregory has a Grado as the Donor Model.
In a demonstration carried out on a TT > Tonearm with a detachable headshell, a range of Ortofon Cart's and derivatives of the Ortofon Cart's were all mounted into the same headshell types and compared to each other.
The Cart's between them had a FGS, FG 80 and a Ogura Vital Stylus.
At the end of the demonstrations it was a shared thought between the attendees that the idea that the stylus only was responsible for the noticed differences would be an inaccurate assessment, it was agreed that the most likely influence was the overall assembly and used materials for the devices that were the responsible for producing the differences being detected.