MUCC has been one of my favorites since middle school, and their most recent single was a return to form from 16 or so years ago(dang I'm old!).
I also recently listened to Devildriver's album Fury of our Maker's Hand for the first time in a couple of years and I forgot how much their older music slaps.
Every few weeks I have a new favorite song, so it's always difficult for me to answer this question. At the moment I really like Hole In The Middle by Emily Jane White
I used to listen to country. Then I started to listen to alternative rock.
Now I mainly listen to Christian music, though I sometimes listen to alternative rock and pop music. Basically, I like all kinds of music, but alternative rock/pop is my favorite.