Its too hard to pick a 'best' I like them all.
But it seems If I Fell is the winner, and I agree John cut through with those lyrics, beautiful melody and harmonies.
'If I fell in love with you, would you promise to be true, and help me understand,
cos Ive been in love before, and Ive found that love was more, than just, holding hands....'
those are great lyrics, with a deeper meaning than songs like She Loves You