Hi,
TD
I do not have a favorite, as there are too many nice things.
Phaedra ... and then check out the anniversary version if you think Analog is still not good, or used!
Stratosfear ... an excellent album, that stands out from all others. In some ways it was totally different, but it was totally far out.
Tangram ... very soft and melodic and totally pretty
Force Majeure ... progressive rock in some ways and very electronic. The visualization on this one is really strong!
Underwater Sunlight ... Very nice, though a few folks I met thought this was New Age stuff ... it was way better than any New Age music ever done other than Vangelis!
Melrose ... mentioned above. For my tastes, these are songs, not passages as before
Rockoon/220 Volt Live ... I like Rockoon, but it feels like far out rock songs. 220 Volt Live is a magnificent concert and I think this is the first of Linda Spa's albums with TD. She is a multi instrumentalist, specializing in composition and I think she helped define "song", into a more classically defined/designed piece of music. She spent more than 20 years with TD, and some folks did not like her saxophone playing though some solos (Jeanne D'Arc) are excellent.
2000+ ... there are too many things to consider!
LIVE stuff ... in the early days, synthesizers were very difficult and rarely would anyone be able to do again what they just did. Thus, any TD concert from the 70's and early 80's is a collectors item, and the number of bootlegs were insane. But they were all so different from each other and this is the appeal that the music has at that time. It really is a movie about the growing up of the synthesizer ... you can hear it fail, do the same thing differently and anything else in between that you can think of.
But remember that "experimenting" was also a large part of the time and place, and this band, and they had many moments in any piece where any of them could take off. In the past 10 years, I find less of these moments, but I can see that they colored what would be a jam part with even more effects and doodles on the music.
All in all, the different members did not change a whole lot of what Tangerine Dream did. There were some personality details here and there, but essentially, the main thrust and feelings remained constant, and it was a flow of music that went in many directions, via the effects and its evocative feelings. I think that the later works ended up featuring guitar, violin and saxophone, more as a different touch, than an improvement for the music, although I have a tendency to never think that any of these were not a part of the whole thing, and look at it as an "orchestra" playing classical music to my ears!