In my experience, FWIW, the biggest electrical problem with phono is hum. Generally, once that issue is minimized, mechanical limitations (warps, pops and clicks, and possibly turntable isolation/arm/cartridge resonances) become the next factors that influence things. I never considered phono stages, per se, a big problem. For MC, a dedicated transformer is theoretically the best noise solution (I don't know how it is now, but back in the day 'high end' makers such as Mitch Cotter designed their transformers for specific cartridges). I don't get too excited about it, one way or the other. I'm currently using a 9 volt battery unit (originally designed by the late EE professor, Marshall Leach, described as a construction project in the belated Audio magazine). Coupled to a 1960s era MC with spherical diamond cartridge and a turntable I bought in 1975--no problems.
I just don't get the vinyl high end crowd. I once read a 'review' of two identical Grace tonearms. One was silver aluminum, and the other a black aluminum. The 'reviewer' was convinced that the black tonearm made the sound 'dark'. Why not? Also, a review of the latest and greatest Technics SL-1200 (four thousand dollars--chump change in analog land). It didn't 'sound right' to the reviewer, but when he changed interconnects to a more expensive brand, that solved the problem. When I read this sort of nonsense, it makes me not even want to play a record. But I admit that it's fun watching them spin round and round. I think it's probably an autistic kind of thing on my part. LOL