I think Mercury‘s design looks more western influenced, like out of one of the cartoons produced in the west, that are heavily anime-inspired. While i think those designs work well, I personally prefer Sailor Moon designs when ephemeral shoujo meets bold shounen. Which is, I admit, quite of a challenge.
I would LOVE LOVE LOVE an anniversary anime project where all veterans from the 90s anime AND Crystal could create short films, based on the side stories or on original scripts. An anthology project with total creative liberty. Imagine Keiko Iwatas version for Casablanca Memories, a 3 minute clip by Hideaki Anno, an alternative 20min ending for the 90s anime directed by Sato, designed by Ikuko Itoh… so many options!