'Dust In the Wind' vs. 'Dust In the Wind'

Kansas recorded "Dust in the Wind" way back in 1977 (about a year after "Carry On Wayward Son"). It became the band's signature song and is still played in heavy rotation on classic rock radio today. "Dust In the Wind" is both melancholy and fabulous. When played live, the song always evokes a positive emotion from the audience. With such a famous song, covers are inevitable. But what happens when the cover is better than the original?
The mighty Scorpions covered the song and included the track on Acoustica.
Todd Rundgren also wrote a song called "Dust in the Wind" for his 1972 solo album Something/Anything? People often confuse the Rundgren and Kansas version
as one in the same, and that's a shame. Guns n' Roses performed the Rundgren track fairly often in the early 90s. Slash's solo is awesome here.
So which "Dust In the Wind" is better? Kansas or Rundgren? Scorpions or GnR?