I've never understood why most music fans seem to have an obsession with ranking everything in lists, they must have ONE best song, ONE favourite band, ONE greatest album. Maybe I'm generalising a little but I wish a lot of these people would wake up and realise you don't have to limit yourself like that! If you like something, great, if not, oh well.
I used to be like this myself. I have been a huge fan of Queen even from childhood but in recent years have become quite the fan of The Beatles too, and I spent many a night wondering who I preferred. Now, I don't care, I love both bands, and that's that.
On another note, I've never been a fan of Nirvana, but the 1960s British band of the same name was even worse.