With lots (and lots) of good music, you almost always have both. Virtually every heavy metal band that I love/follow has great lyrics and amazing music to match (that DOES match, in tone, atmosphere, emotion, etc.,). Taking away/dumbing-down either the lyrics or the music would ruin it for me.

The problem is that tooooooooons of bands have sh!t or trite lyrics, but people love them anyway and try to project meaning or depth onto them, or just ignore them completely and it doesn't take much away. Not my type of band.