The author definitely pushes towards ending with Jill. Other girls can be chosen but it's a more difficult choice in most cases, at least for me. It's like the author keeps hinting, "Are you sure you want to choose her over Jill?" over and over again in the story. Personally, I wish the other LIs looked more viable compared to Jill. I wish it was a more difficult decision in the end but all paths push towards Jill IMO.
Josie and Maya aren't a very attractive choice to me overall. The fact that Sage is dumb and still wants to fuck Chad after she discovers his cheating turns me off to her, despite her gorgeous body. Isabella being married with a husband that could return at any time and with the large age gap puts lots of question marks on her. Plus you have to basically betray her best friend Jill in order to be with Bella in the end.