ANOTHER JD best of!? Why!? Anyway - nice photo but 'Substance' is still the best compilation - originally issued and authored by Factory with all the help of Wilson, Gretton and the surviving band members. 'Permanent' was just a cash-in job that came out when Deborah Curtis' book was originally issued and this looks like a cash-in job too.
If you have to get a bootleg gig, get the gig at the Paradiso, Amsterdam 1980 - you'll find plenty of info on why and on what boot it's available on here; http://www.joydiv.org/c110180.htm
Of course there's always the 'Heart & Soul' boxset - more expensive than the 'Best Of' but it contains almost everything the band ever recorded, including the two studio albums.