My top 2 are the Rumours and Tusk deluxe/expanded editions. Then Mirage and Live. All based on extras (alternate versions, unreleased songs, etc.).
Tango was interesting but those 80s remixes I didn't like. I listened them once and never again.
A special mention to the 25 Years - The Chain box set, where I enjoyed those versions of Gypsy and Isn't it Midnight, plus the CD 4 dedicated to the early years.
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