Obviously, I can only speak for myself, so I'll explain my choice for my favorite primary love interest. I'm ruling out both Maya and Josy. I know Maya gets a lot of love around here, so what I'm about to say is probably not going to go over very well. I find Maya to be the least attractive of the primary love interests. Also, the whole storyline where they were actually dating each rubbed me the wrong way. Next on the chopping block is Sage. As attractive as I find Sage, I really don't think she has the emotional maturity to be in a serious relationship. She was fairly certain that Chad was cheating on her and instead of ending the relationship, she chose to "get back at him". She's a great FWB but she's not girlfriend or wife material.
Let's tackle Quinn next. I think that Quinn is actually the dark horse of the love interests. If I have to judge her as she's currently presented in the game, I'd say that she'd be tied for second place. I do think that after bringing her to your room and taking care of her, her attitude will begin to soften. However, she's obviously in a bad situation right now and probably has a lot of emotional issues that MC would have to help her through. I don't know if I'd want to deal with the emotional baggage that Quinn would obviously bring to the table.
Next up is Jil. On the surface, Jill seems like the obvious choice for a love interest. However, she has some flaws that need to be addressed. First, I have to say that in terms of physical appearance, Jill is nearly perfect and is the second hottest character in the game, in my opinion. She seems kind, caring, and surprisingly well adjusted, and down to earth. Especially, considering how wealthy her family seems to be. I have two big issues with Jill though. First and foremost, she seems to dislike Tybalt but doesn't have the spine to tell him to fuck off. Secondly, she seems to baby MC a bit. This is incredibly apparent when she goes behind MC's back and reports Chad. Those two things aren't deal-breakers but they are behaviors that would require a serious conversation.
Last up on my list is Bella. First and foremost, I love Bella's physical appearance. She is easily the hottest girl in the game, at least, in my opinion. When it comes to Bella though, there are some obvious elephants in the room. Namely James and what exactly happened between him and Bella. I do think that Bella does genuinely care about MC. However, much like Quinn and Sage, there's a very real possibility that Bella has some heavy emotional baggage. If I were basing love interests purely on lust/levels of attraction, Bella would win. No contest. However, if it was based on which character I think MC would have best shot at having a lasting relationship with, then it would be Jill.
