In my opinion, The Smiths have some very good and well-rounded "best of" and "greatest hits" collections (two very different things). However, unfortunately, Morrissey has nothing of the sort for his solo recordings. I think the most solid solo "best of" is the America-only 'The Best of Morrissey', but I would be reluctant to recommend this to someone who might want a Morrissey "best of" because it doesn't feature anything from his three most recent albums. Sadly, 'The Very Best Of', which I actually think is an unfairly criticised little collection, doesn't feature anything from the last five albums, despite being the newest! 'Greatest Hits', which is the most career expansive, is also the most lopsided, focusing too much on two more recent albums. Considering how soon Morrissey released 'The Very Best Of' after 'Greatest Hits', this leads me to believe that the two are probably designed to compliment each other. From that perspective (ignoring the slight overlap with a couple of songs), I think it works.
Anyway, I voted for 'The Sound of The Smiths'.