I have never been a one style / one group sort of guy and I find it difficult to relate to the idea of "the best ever" as there is so much diversity in music. I love music from so many genres and believe that each style has it's good and bad points.
I love Surfin Bird by the Cramps but it is no exercise in songwriting , the lyrics of a lot of songs are absolute garbage , but as a whole package the song works.
One of my all time favourites is a song called Bloody by the Long Tall Texans and to be honest I doubt it would be to everyones taste , I don't realy care what others like as I believe if we all liked the same things that would be so boring I would be forced to go on a crusade to shake things up.
LZ were a rock group and as such could never be considered "the best group ever" , maybe they would be the best rock group but I garauntee all the soul fans or jazz fans would argue the point that musicaly thier choice was better.
Each to thier own .
I love rock and LZ aren't my number one ,I would have difficulty in choosing an absolute favourite because one day I can't get enough of The Animals and the next day I would rather listen to Alice Cooper.
I could fill this site with the names of the groups and singers I listen to and prefer to approach new music with an open mind as I believe that only by being diverse can I realy pinpoint what I like and don't like.
As a small example I love
BB King (Blues)
M3T3ORS (Psychobilly)
Eddie Cochran (50s R'n'R)
Right Said Fred (80's Pop)
Queen (Rock)
Hayseed Dixies (Bluegrass/Country/Rock)
The Specials (Ska)

I could go on with this list but I would run out of space and time before I got to the end.

IMO If you like it then to you it is good music and what does anyone elses opinion matter :thumbsup: