I've owned the Atmasphere MP3,the PHD, and now the Steelhead.
All very good at what they do, and better than all of the built in phono stages on older preamps that I owned like the Premier two, Audible Illusions 3a,Sonic Frontiers slp1,and even the original Levisnon JC 2 that I felt was the only SS phono stage that was decent in a preamp.
I've listened to my friends Nagra phono stage and felt it was also quite appealing, but I never owned one or used it in my system.
There are lots of choices and designs, and IMOP any of the aforementioned phono stages in this thread would be a great asset to any vinyl set up.
But flexibilty if you contemplate swapping cartridges, can narrow the search,so features matter.