I had to really think about this 'cause I like a lot of his stuff, particularly from the '70's and '80's. My Top 5 were, in no particular order:
- Someone Saved My Life Tonight
- Philadelphia Freedom
- Nikita
- The Bitch Is Back
- Sorry Seems to Be the Hardest Word
But if I had to pick one, I'd go with
Someone Saved My Life Tonight.