I feel privileged and fortunate to have a Grado Epoch3 MI cartridge.
It instantly replaced my, highly regarded, Lyra Atlas SL.
By that I mean it did not “cream” the Lyra, but it greatly surpassed it in, the always vital and central, musicality. Most important to me, voices sound more natural.
I bought the Grado because I was curious about MI. Everything I read about the, somewhat legendary, MI Decca London Reference made me long for that kind of sound. But the Decca turned out to be out of production. And those who own them seem to hold on to them tightly. And I don’t think there is anyone who rebuilds them. I may be wrong about that.
MM (MI) or MC? One can’t generalize. But, surely, there are now outstanding cartridges of all types.