From the Original Series (1992-1997):
* Episode 46: "A Promise to the Moon": This is the climax of the Dark Kingdom arc and a very emotional episode. It features Usagi's powerful transformation into Super Sailor Moon, her heartbreaking acceptance of her destiny, and the bittersweet goodbye to the fallen Sailor Moon.
* Episode 89: "The End of the Nightmare": This is the finale of the Black Moon arc and marks a significant turning point in the series. It showcases the power of friendship, self-sacrifice, and the resilience of the Sailor Guardians in facing unimaginable challenges.
* Episode 143: "Sailor Moon: The Movie": Though technically a standalone film, it's considered part of the original series. It's a beautifully animated, poignant tale that explores themes of self-discovery, responsibility, and the importance of inner strength.
* Episode 171: "The Light of Hope": This is the heart-wrenching finale of the Stars arc. It features powerful displays of love, sacrifice, and the ultimate triumph of good over evil.
* Episode 187: "Usagi's Choice": This episode explores Usagi's inner conflict about her feelings for Mamoru and the weight of her responsibilities as Sailor Moon. It's a mature and emotionally resonant episode that showcases the complexities of Usagi's character.
From Sailor Moon Crystal (2014-2016):
* Episode 14: "The Power of Friendship": This episode is widely praised for its adaptation of the iconic "Black Moon" arc. It features a beautiful rendition of the "Moon Prism Power, Make Up!" transformation sequence and showcases the strength of the Sailor Guardians' bond.
* Episode 26: "Sailor Moon's Choice": This is a powerful and emotionally charged episode that features the final battle against the Black Moon Clan and showcases the Sailor Guardians' ultimate victory.
Ultimately, the "best" episode is the one that resonates most with you personally. Consider what aspects of *Sailor Moon* you enjoy most, be it action, character development, romance, or humor, and pick an episode that emphasizes those elements. There are so many incredible moments in the series, so take your time, explore, and find your favorite!