This is a fantastic question, so I'm quote-reposting it rather than just replying.
I think it has to be "Shakespeare's Sister". It's post-The Smiths and not on Hatful Of Hollow, a stand-alone which could've been MIM's lead single, it's really thrilling, and the R'n'R vibe matches other MIM tracks.
Simon Price
Great article. Biting wit replaced with feeble comedy. Exactly.
Talking of MIM - what one track would you add that isn't HSIN to make that a proper 10 track record.