Ug, this is so hard. Do I have to choose just one?
Of the list I chose "A Hard Day's Night". I grew up loving that album and the movie. While all my friends were obsessing over New Kids on the Block, I was in love with The Beatles. My mom had taped all the albums so I could listen to them on my Walkman and "A Hard Day's Night" was easily the one I played the most.
I still love "Let it Be" even though most of the Beatles themselves loathed that album because of all the tension and pre-breakup things going on. I even liked the documentary.