I enjoy different pianists for different reasons, but there are some general characteristics that carry over between the ones I have enjoyed the most, although they are still very individual players/people to me.
The pianists I have chosen to listen to the most repeatedly and in-depth are Marik, and Alexandre Dossin. Gould is somebody I will listen to, Horowitz, Richter, Brendel. I had a time of listening repeatedly and in-depth to Mark Westcott. And then I've listened to numerous others, of course. But, I am a person who actually does not listen to music in general very much - a little bit goes a very long way for me, so it's a very big deal for me to listen to somebody repeatedly. I am extremely particular about what I listen to overall, of anything, and often prefer silence or listening to the world around me. Sometimes if I can't sleep, there are particular things I'll listen to.