I'm sort of torn. Personally I prefer Gabriel's progressive stylings to Collins' pop, although I love 'One For The Vine' as much as any of Gabriel's songs.

My rough order of favourites, because I like making lists:

1. One For the Vine
2. The Musical Box
3. Anyway
4. Firth of Frith
5. Fountain of Salmacis

Although I love just about everything (I Know What I Like as a notable exception) they've done pre-Hackett leaving.