90s Moon Cosmic Power was the most lively and some catchy music.
Crystal: Gonna have to join the masses with Mars and Jupiter in the forefront with best in Season 1 & 2 but Venus is a pretty close second because it's flashy and she has ribbons and it suits her so we'll.
Special mention: Mercury henshin into a pool.
PGSM: Giving this one to Darkury. Short but super impressive.
Sailor Moon S Movie: Luna
What would be a rather impressive transformation would be the Senshi transforming like how Moon Crisis is from SuperS. I'd like to see something like that but kinda semi instant or whatever. That be cool.