Wow, you surprised me with your Tull choice Soundmaster. Not because it is anything but a completely fantastic record (which it most certainly is), but simply because I thought you'd pick Heavy Horses or Thick as a Brick....
Interesting. Anyway, Benefit rules, but that's the thing with Tull...so VERY many absolutely fantastic albums and eras, and each (generally speaking) as different from the next as it is the last....Ian Anderson is the man, that's all there is to it.
My top five looks something like this:
Thick as a Brick
Songs from the Wood
Minstrel in the Gallery
Aqualung
Benefit or Stand Up
But then again, there is also War Child, Heavy Horses, and so on and on. Really, one of the most consistent back catalogues in rock...