I think Bella is second place. Jill is the most popular overall, specially where it counts (Patreon). Why? Probably because she is virginal, nice and hot. The more safe choice to marry and have some kids, etc... She is the "perfect wife material".
About the Bella problem... I said before, but for me everyone on her path already expects some doom and gloom. James is gonna show up, she is secretly crazy or have some major mental health issues. There's a lot of possibilities and theories regarding her past and marriage. So, i think most people that are pursuing her (me included) expects that it won't end well. But hey, not every amazing story has a good ending.