difference between all the compilations?

[mikemono411]

Hi all,
I have all 8 of Stevie's solo studio albums but am wondering if I should bother getting any of the many compilations that have been released over the years: Timespace (1991), the Enchanted boxset (1998), Crystal Visions (2007), or Stand Back (2019).

I've gone through the track listings of each and there are some obvious differences and exclusives to each set. But, more specifically, I'm wondering: should I buy the individual songs from the sets that I don't have? Any entire set recommended for any particular reason? Any songs that are alternately mixed from the studio albums?

Thanks for any and all help!