Neil Young's version is not a version. It's the original. He wrote the thing, and recorded it when he was with Crosby, Stills, and Nash. And if you really want the best "version" of it. There's a live recording of just him in '71 from Massey Hall. Though I must agree this version is lovely, ...
Adele and Lady Gaga, most amazing voices of women performing in music industry, hands down. :) Lyrics are solidly written too!