Dont really have a favorite song. I like entire albums.
Wish You Were Here is a phenominal album. And of course Dark Side is great, even if it is overplayed. Didnt really like the Wall that much. Liked Pigs, meddle, and Obscured by clouds. Honestly have listened to the final cut, Momentary lapse of reason was meh but Division Bell was solid.
One thing is the duo of waters and gilmour made the band. Gilmours music is awesome while waters lyrics take the song to the next level. Both on their own are meh, but I do like Gilmour more. I would go to a David Gilmour concert where I wouldnt a waters concert. I do like the Live in Gdansk album by Gilmour.