I actually think they all love MC and don't believe it's really fair to rank them.
Both Josy and Maya are always happy when MC's around and although Maya obviously has other concerns, she's very much into him although she thought she couldn't even like men, and it's not like MC's the first man she has had around, so only love could really make her accept a three way relationship.
Josy in contrast has had pretty much no adversities so far, and she also accepted that she liked MC even before Maya was in the know, so for her it's just really easy to be all lovey-dovey with him now that her only concern is pretty much just hiding from Maya's dad.
Sage is more conflicted about her feelings for him but you can see by her reaction at the end of EP8 that she has completely let her guard down and has fallen for him badly.
Jill, c'mon, there's no way it's just sexual tension, she has done so much for him and he for her, she's fallen hard and that's even more evident by her reaction if you choose Bella after pursuing her.
Then comes Bella, obviously the most complicated case, but she herself has questioned why their attraction can't just be carnal, after nearly having several breakdowns, by EP7 she clearly starts accepting her feelings and that's even more apparent in EP8, when although their first date went horribly wrong, she still decides to pursue MC and agrees to try and face the bumpy road they have ahead. This isn't something that someone does just out of lust.
Now, love is different for everybody and it's true that can be stronger for some and weaker for others. But even then, all the LIs emotional baggage, circumstances and levels of maturity are so different from one another that I don't think it's fair to compare them.