This might be biased, but this is my favorite season of the show. For some odd reason, this season is the most memorable season from this anime to me. I remember Pegasus so much. The humor and the characters was what made me love this season so much.
If you want to rewatch a season, I would suggest this one. The whole dream mirror arc was interesting to me. Each episode had such a powerful meaning and impact on me as a child, that I think I still take it to heart to this day for these meanings. The character development between rini and serena/usagi really shows a lot throughout this season, so I would suggest watching this season.