For a full checklist of songs and different versions see the passionsjustlikemine.com website.
The version on Hatful and also Sound of the Smiths is, as said above, from their first John Peel radio session in May 1983 and the version which Morrissey prefers.
They later recorded it for their 1984 debut album (The Smiths) which is the version on Singles since it was their third single. Morrissey was always very critical of the single version even though it was a big hit. The Smiths stopped playing the song live by the end of 1984 and it is unlikely Morrissey will ever play the song live again.
Despite Morrissey's preference, a lot of fans still prefer the single version because that's the one they would have first heard on Top Of The Pops etc back in the day.
For a full checklist of songs and different versions see the passionsjustlikemine.com website.
This. But also the first press of the 12" single is an extended version that I don't believe has been released on any CD compilation.
12 inch extended version? You sure about that?
Jukebox Jury
Technically I think it's correct. There was one version that was slightly longer by a few seconds. I'd hardly call it an "extended version" but it is a longer version of the song. Certainly in comparison to the 7" edit.
By the way, Goddard reported that Morrissey himself preferred the Peel session version.