Strange! While my "top row" have been mostly weighted towards one of the styles of music I listen to, it's at least on point in that way. The row below usually lists bands similar to "some other artist I've listened to a lot."
So, both are decent, though don't encompass all my tastes.
For recommendations more in a certain genre, I've just been starting a "radio" based on a song or artist and then picking up on some of the music that shows up there.