When listening to flamenco recordings, how can I tell the difference between a fandangos and a soleares?

The other forms are pretty straightforward to me (tangos, bulerias, rumbas, alegrias, malaguenas, etc). These two are difficult to tell apart for me. Any thoughts on how to aurally tell the difference? I'm listening to Camaron and Paco de Lucia/Tomatito for the most part.