I go for Floyd. I´ve got both of their catalogs and listen to their work front to back. Each band has an album that I absolutely can´t stand later in their career (Coda-LZ and Final Cut-PF) but in general, I listen to Floyd more, I know them better, and hate hearing them on the radio (since it is either going to be "Money" or "ABitW pt2).
In high school, I listened to Dark Side on a daily basis, either in my car or in my room. Since then, I got exposed to the rest of the material and liked a lot of what was going on before Dark Side.
On an unrelated side note, an unsubstantiated rumor: In 1967, Pink Floyd with Syd Barret at the helm were busy recording their first album, Piper At The Gates of Dawn, at Abbey Road studio. Another band heard the sound that these guys were making and said, "We need to make an album like this!"
The band was the Beatles and the album was Sargent Pepper.