I don't have favorite bands, but I have favorite albums in no order:
1. Fear Factory - Demanufacture (1995)
2. Metallica - Master of Puppets
3. Dio - live album Intermission.
4. Metallica - Ride the Lightning
5. Megadeth - Greatest Hits
Hangar 18 (Megadeth), Battery (Metallica), and PissChrist (Fear Factory) I think are my all time favorite metal songs.
>Ever been to a concert?
Not a metal concert but I am not in favor of live music in general except perhaps for classical music. The Dio live above album is the only metal recording I consider better than the studio recordings of the songs. I think it is more hard rock than metal to be honest.
Remarkable how metal has failed to last or replicate like its great 80's run. It is strongly arguable that Master of Puppets, now almost 35 years old, is still the greatest metal album.