I have gone the three arm (one with a removable headshell) route. My best cartridge, Hyperion MR, is a permanent resident on my best arm, the second fixed headshell arm has an excellent Hana Red that is my current go to stereo cartridge while my Myajima Zero currently is on the SME 3012r arm with intechangable headshells. I can swap in a Kleos, upgraded Denon103r, or Andante P78 all mounted on their own headshells for fun. Each cartridge has a counter to remind me to enjoy all of them and not put too many hours on a single one. I am very adept at cartridge setup, but the ultimate fine tuning requires time and I prefer to enjoy the music as opposed to a lot of fiddling constant changes could require once the final adjustments are made.