FR66S vs Ikeda IT-407 vs FR66FX

@dover Thank you.
How about the difference between FR64S vs 66s vs 66FX vs IT-407 cartridge and rest of the set up being the same. 

I am going to try others cartridges like an SPU, Koetsu as well 

@dover is tracking force equivalent to compliance. Low tracking force means high compliance and vice versa. 
I also have a Thorens MCH II van den hul cartridge which tracks at 2-3 g. So I can use a heavy tone arm for that I guess. 

Are you saying the Reed 3p and Schroeder tonearms are better than 64/66S everything else being equal?
how about early version IT-407 vs 64/66S?

What do you all think about Osiris tonearm which is held by a magnet.. that’s pretty