Many other artists/genres before Nirvana put Seattle on the map musically. Nirvana brought MTV and the rest of the world to Seattle and made grunge a household name. If it were not for Mudhoney or Mother Love Bone, neither Nirvana or Pearl Jam might exist...those bands are the definition of grunge.
To the question, I'll have to pick Pearl Jam. For the simple fact that they are still around making music, I'm not a huge fan of suicide, it proves nothing and Kobain took away other band members chances of making good music for many years.
Nirvana was good...just have to wonder how good they could have been.
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