Is Songs/Horses/Stormwatch considered an actual trilogy or do they just seem like it? In any event Heavy Horses is my favorite of the three. Songs used to be, but I played it out in high school and have never been able to recapture that magic nowadays as I can with Aqualung.
Stormwatch is pretty mediocre, A is a personal favorite but everyone else hates it, I don't give a shit about Broadsword, and Under Wraps is Martin Barre's favorite Tull album but which I've never heard and is the last album before Ian Anderson's throat got ####ed up. After that it's pretty rough waters.