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By the way there is a bit of compatibility between the 30MS and Megami Device line. I was able to use 30MS Siana's arms, thighs and legs on my MD Witch for example!
But since Koto is also moving towards the more barebones kits like Susanowo/Amaterasu Regalia and the Buster Doll Lines, I feel like there's really not much reason to go with 30MS unless you want really like the character design and want some variety? I find the sculpting of the Bandai kits a bit more simple than Koto's; not sure if that's a cost reason, or if they're trying to avoid too many sharp edges and small pieces so that the kits can still be marketable to kids.