I'm the opposite of you. I believe that in The Beatles, Paul was the best at writing songs and as a solo artist John was 
For example, I prefer And I Love Her, Yesterday and Lady Madonna over I'm Only Sleeping, Help! and Across The Universe
However, I prefer Jealous Guy, God, and Real Love over Maybe I'm Amazed, Band On The Run and Live And Let Die
A side note; I'm aware that the rest of The Beatles helped with Real Love, but John wrote it