I was Always Impressed by this Version of Chibi-Usa the Most, felt like she really matured to a full fledged member of the team, become a Full Fledge Sailor, had a good story arc and was one the main reasons why I liked SuperS, The Anime I am talking about!
Black Lady is my favorite. Her arrogance, ruthlessness, and cunning combined with her awesome power makes her the anti-Sailor Moon in pretty much every way. Super Sailor Chibi Moon is my second favorite. By that point, she's become a mature and experienced guardian capable of leading her own team.