I like both MC's however I feel like Ian's story was better in terms of characters because of Cindy who is basically the girl next door, Allison who is just there for the sex (she is pretty meh), Perry is that one dude who is weird but at the same time, he is the bro that got your back and finally Emma who is pretty chill and just exhibits vibe. With Lena's story, you have to deal with pushy dudes including your ex, you have a "best friend" who always wants you to get laid and degrade yourself, and finally you have to deal with the morality of selling yourself to different people for cash, become another ivy or be yourself. Overall, its a pretty good story. I wish I joined patreon earlier to support eva so I can vote in the poll haha
I have made the argument before that Ian's portions generally feel better to play because he's got a wider supporting cast and more pleasant sexual/romantic options. Besides Ian himself, Lena's only really got Holly if you aren't into scumbags or Louise's clingy drama schtick.
I do however disagree about the claim that he has more development or that his story is more interesting, I directly disagree with that.
I actually think the monetary issue on Lena's path makes her story interesting because you have to skirt the boundary to corrupt-town unless you wish to either give in to it, or fail your parents.
Lena's story, disregarding all the sex and potential love, has bigger stakes in my opinion, she has a real conflict.
They both have dreams and ambition, but Ian can pretty comfortably cruise through the story without much drama, if the player so chooses. Not being confrontational with Minerva pretty much secures Ian's regular pay with no further obstacles. From there it's just to choose who to fuck and not to fuck.
Both Ian and Lena have variables and interactions that can give different impressions of the kind of people they can turn into, in this regard I think they can both become interesting characters.
Tl;dr:
Ian gets a + for a solid cast of characters and partners, he gets a - for lack of competent drama.
Lena gets a + for having an interesting background that plays into her story and challenging living conditions, she gets a - for having a small cast of supporting characters (two of whom fucking despise each other) and very few partners that are interesting to me.