Of the many manga of the same type that I've seen this is one of the ones I like best. I think it's because the protagonist is (so far) clinging to her goal of fucking off to a nunnery as soon as she's able and trying not to get involved with all the self-important nobles hanging around or replace them with the suspiciously kindhearted prince of some neighboring country or some such nonsense. I'm almost certain that will change, at which point I'll probably lose interest, but for now my inner Robespierre is satisfied (as he is also in the case of Lady Rose Wants to be a Commoner).
As far as love interests go, Claudia is a dick and should be immediately discounted. Yulan seemed nice at first, but he's been showing an overbearing side that borders on yandere, not to mention getting involved with him will keep her in the fold, so to speak; if I had my way she would quit the society of aristocrats as soon as possible and just go do her own thing. Ideally she would either not pay any attention to romance or go the yuri route with Marin, who is the only other character besides Yulan who has been shown to genuinely care for her (leaving Maryjun aside because she's an oblivious airhead).