What are the others?
Past Lives (includes Live at Last and a tracks from the 1970 Paranoid tour) and The End (the final Sabbath show).
I don't think Ozzy sounds very great on The End, which was recorded in 2016 (?). Past Lives doesn't really have great production, but it is a good representation of the band in the 1970's.
Reunion was recorded in 1998 and the band sounds great, Ozzy's voice is in great shape, and the production is really good. I still have a lot of memories of getting this album when it came out, having seen them headline Ozzfest in 1997 and 1999.