I’m no expert, but I got help here and learned enough to avoid mistakes.
Phono, anything phono, if possible get return option, it’s a world of ’preferred, not better’, no way of truly knowing how something will sound in your system except by trial.
IF you love your MM Phono Stage, then go for a SUT with some optional settings to fit your current and future variety of LOMC. SUTs are passive, my experience with my Vintage Fidelity Research FRT-4: no sound signature of it’s own. Absolutely no hum.
Just enough gain and proper range of impedance to keep using my Vintage McIntosh mx110z’s Tube MM Phono. It's 4 optional gain/load are linked together: even better would be independent gain and load settings, but that usually pushes the price up.
Any chance you might go to two tonearms? i.e. Playing some Jazz, this one's MONO, use the other arm that's all set up, turn a switch, drop that needle. IF so, a SUT with multiple inputs, front selectable, is great, including PASS for MM so no cable change is needed.
Entre ET-100 is similar
Often, the numbers make no sense, do your research, ask, I had to find the original specs of my FRT-4 to decipher what gain/impedance the switch positions actually produced
SUT Info I posted here