I have fallen in love with the metalcore/deathcore genre for almost half a decade now. I have tried numerous time to pin points why, but could never figure out a specific reason. There's something about the harshness and emotions that are portrayed in the songs. I personally find most pop music and rap music fairly boring, but for some reason metal keeps up with my mental pace and keeps me content. Also, the community is great, and there are some many bands that you can personally connect to, so there is something more about their music then just how it sounds.
Band Examples: Architects, Whitechapel, After the Burial
I also listen to a lot of 90's alternative rock. I think the appealing part of this genre is that there are so many unique bands, but all have similarities at the same time. I enjoy the classic use of guitar, and drums, and many time the vocalists send important messages through their lyrics. Also, 90's alternative rock is such a large genre of music, there is always something that appeals to everyone.
Band Examples: Our Lady Peace, Bush, Moist, Matthew Good Band