With one SUT you can't use all MC cartridges, such phono stage is not universal for all MC. It will work for some of them nicely, but if your cartridge impedance is very low (2 Ohm) or very high (40 Ohm) you can't use one SUT for both of them.
Active phono stage with optional gain and optional loading is universal, one phono stage for all MC cartridges.
Active phono stage with optional gain and optional loading is universal, one phono stage for all MC cartridges.