Favorite member? GRACE GRACE GRACE GRACE GRACE!!!
I love the fact that she's like, the ORIGINAL girl rock star, and yet she (at least in the airplane days) was pretty much totally out of step with the whole rock and roll thing. If you listen to the melodies and chords of her compositions, they have a lot more to do with orchestrated jazz or even classical music than anything the Rolling Stones or the Byrds were writing - I swear to God I can hear strains of Claude Debussy in Rejoyce, Greasy Heart sounds kinda like this one Miles Davis tune, and White Rabbit's rhythm is 100% shamelessly stolen from Ravel's bolero.
SO creative... and far more original than say... oh, Paul McCartney?
Not to mention the voice... but I think a LOT of people overlook her songwriting.