As part of my building a music collection, I've sometimes you have to choose between buying whole individual albums and buying recordings that only hits such as compilations either because of economics (albums may be very expensive if out of print) or many of their hit recordings were not on the albums.
For many Motown artists from the 60's, albums were a secondary consideration to the 45's typically containing a couple of hits, their reverse sides and then 8 cover versions so in many ways the compilation if chosen with care makes more sense.
I also have the Gladys Knight and the Pips, Stevie Wonder and Junior Walker and the All Stars volumes although I don't own the Diana Ross & the Supremes (have both UK volumes of "Greatest Hits" instead), Smokey Robinson and the Miracles and Temptations volumes also issued at the time.
Junior Walker's Anthology is desert island material for me being very distinctive borrowing a lot from jazz.
Also in the series is the Temptations one covering from The Way You Do The Things You Do to 1972's All Directions album.
My copy is the US edition. I also own the 1973 1990 album in a UK pressing STMA 8006
Apart from find good stereo recordings, each set has a full colour insert with background capsule, essay and exclusive pictures.
I have the two UK single lps of Diana Ross and the Supremes Greatest Hits as issued in 1968 and 1970 that have most of the tracks featured in the 1974 Anthology set as well as the 1974 'new' Supremes Greatest Hits covering the Ross less recordings from 1970 thru 1973 such as Up The Ladder To Roof, Nathan Jones, Floy Joy and Bad Weather.