When I first read both novels in my early teens, I liked both but unquestionably preferred The Dispossessed.
What do you suppose you can tell about me from that?
The most obvious thing that springs to mind is that when I was in my early teens I was far more obsessed with working out how I felt about politics and justice than how I felt about sex and gender. Strange but true.
My opinion might be different these days - I haven't reread The Dispossessed since I was a teenager, and it might look less eye-opening now.