They're all so damn good!! I cannot decide which song is the best as it all depends on the mood and situation I'm in. Can easily relate to any song of their's I listen to...However, for me, their best album would be the White Album and a close second would be the Sgt. Pepper's one. Am listening to this as I'm typing this: Blackbird: Another one: A day in the life (McCartney/Lennon songwriting at its zenith):