in my opinion both songs have their good bits in them, for instance like someone else said the harmonies in the demo version is better than the album version - to me the tempo of the demo seems to be a little faster and of course there's the end solo

But in the album version Jon's vocals are better and also the heavy guitar riff that is the intro to the song is there too, it does appear in the demo version but in the bass and not on the lead guitar - and 'undivided' at the end of the chorus works better than 'one'.

Both have their qualities, but it is a spectacular demo!