In advance, please save any hateful comments about Yoko for the numerous 'Yoko Haters' threads that already exist. Any negative comments about Yoko Ono (beyond a critique of her recordings) is off-topic and unwelcome.
A favorite album of mine is Approximately Infinite Universe. The songs "I Want My Man To Rest Tonight" and the title cut are great numbers. Fly is also a favorite just because it is so weird. "Don't Count The Waves" and "Mind Train" are stand-out cuts. Although the title track is a bit long winded.
But her best (and my favorite) is (Yoko Ono) Plastic Ono Band. The album is timeless in the sense that it doesn't sound like its from 1970, nor does it sound like anything from today. The only other recordings that I can compare to it are Velvet Underground recordings...both (VU and POB) are the true proto-punk albums.
I know I won't make too many friends here by saying this but...Yoko is brilliant.