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Bastet: You mean "She's Leaving Home" from sgt. peper's.... I suppose
Well, how can you say which is the best Beatles song? They are so different, there's such variety in their work, I can't even compare the songs. But a few would be "Across The Universe", "While My Guitar Gently Weeps", "Strawberry Fields Forever", "Golden Slumbers".......
But I like their early songs as well: "I'm Happy just to Dance with You", "The Night Before", "It's Only Love", "You're Going To Lose That Girl", "Another Girl", "Girl" (all the "girl"s, in a few words) and most of Harrison's songs.
BTW, "Across The Universe" has the best connection between lyrics and music in the rock history, in my opinion. UNBELIEVABLE!