Sunshine is probably a top 5 iconic riff. To not vote for a Hendrix song in 67 seems wrong though. I would've listed Love or Confusion and/or Manic Depression and probably voted for Manic Depression.
Hendrix was a better player than Clapton and his 2 albums in 1967 destroy Disraeli Gears.
But Sunshine IMHO is the birth of heavy metal.
Hendrix had too much soul/funk to his playing to invent metal.
This is an example of how not all titles are created equally and how measuring whether you win a title or not needs to be examined within the context of your time.
"Sunshine of Your Love" is an all-timer
"Purple Haze" is just a play better