I play Missy as a switch, best of both worlds.
And to be frank, whether I sided with Malia or with Poppy was simply a decision of whom I liked more at this point and it was definitely Malia. Even if you consider the Cliques (aside from the fact that it's technically a Lady Garden's problem with the school being the unfortunate spillover), the Popular Girls have at minimum two characters (Malia and Becky and her friends) with whom Missy gets along quite well. Compare that to the Bad Girls, who lack any likeable characters or redeemable features at all. The only person who seems to have her shit together is the girl Missy was hanging around in the isolation room (I think her name was Tish?), so again, a total no-brainer.
So me personally I wasn't really thinking about dom/sub here, but how the story was framed. I played both and I prefered the dom route even though I played Missy more on the subby side (to get closer to Paris, good stuff btw). Stockholm Missy route provided an interesting perspective though about Malia and the Popular Girls' completely ignoring the critical weakness that was Missy in a world were slave conditioning is a thing.