This is extremely hard for me. Both the Guns N' Roses, and Metallica are my two favourite bands of all time. The Guns N' Roses had a specific sound that made them stand out. That sound includes Axl Rose's voice, Matt Sorum's drums, and Slash's guitar. All that together made them one of the most influential bands of the late 80's, and early 90's. Not to mention all of their incredible singles, including "Sweet Child O' Mine". Metallica, they have also done shitloads during their prime. All the awards they have won are outstanding. Not to mention, Kirk Hammett who has been called one of the greatest guitarists of all time. Their awards list is impressive, but the singles are equally too, "Enter Sandman" is a true master piece.
The Guns N' Roses have released four studio albums, and all four went platinum. Here they are: "Appetite for Destruction" is 15x's platinum, "Use Your Illusion I" and "Use Your Illusion II" are both 7x's platinum, and finally "The Spaghetti Incident?" is only 1x platinum, but still impressive.
Like I mentioned earlier, Metallica has garnered many awards, and here are the credentials: 7 Grammy Awards, 2 MTV Video Music Awards, 2 American Music Awards, and 3 Billboard Music Awards.
Both those lists are very impressive, equally so. Both these bands have done a lot for the music industry, and have influenced many of today's bands. But I can only choose one band, and that band is the Guns N' Roses. They are both equally great, but I just have to choose the band I liked more. I won't be mad if either win, but in my opinion, it should be Axl Rose and co.