Oof, it's hard to compare them when most only have the barest hints of their final storyline. I'm a huge fan of Lana, Myrtle, Gomira, and Anne. All gorgeous and each has their own great personality traits already. Really excited for the Gomira update and for Anne to eventually get some content. Maybe in the end she will go work with Lassie's moms back home?
Rose I am interested in learning more about, and her kiss scene is hands down amazing, but if she turns out to be a werewolf as I suspect, she will probably drop to one of my least favorites. What are the "glue potions" REALLY for, Rose??
Celestina is obviously Worst Girl (mean and cruel personality, no amount of magical beer goggles can fix that), hands down. Any update focusing on her will be a huge letdown to me unless it's a complete retcon that reveals she's actually under an evil curse that forces her to behave cruelly, and gives us the chance to break the curse.
Holly the Shepherdess I could go either way on, it depends on how she develops as she thaws to Lassie. I like the notion of a fake marriage that grows and deepens to something more, and I'm curious to see how Holly feels about Lassie's sleeping around once she starts to wish the marriage was real... I'm guessing that the formerly "haunted" mansion will eventually get fixed up and become more of a home base for the plot rather than Lassie's tent as the main story progresses, and I can picture Holly moving in there as the lady of the house. However I don't know how she'll feel about a harem of other waifus living there too.
Maple could also stand more development, as things stand she's not among my faves. So far it's been a pretty simplistic "rescue the damsel, get a sex prize". That's fine as far as it goes but we need some character motivation. Maybe she will come into conflict with the hunter family over exploitation of the forest and there will be hijinx where Lassie has to help protect the cute mama and baby foxes? One thing the game has so far lacked is any branching plot choices where Lassie must choose who to make happy. I'm curious whether Magicnuts intend to always avoid such choices or not. I could see a story choice where Maple's sex content and another woman's sex content are not both achievable in the same playthrough because the player must choose which "side" Lassie supports.
And so far I'm less than impressed with Greta and Simone because both are such simplistic tropes. Other than bringing Lassie food, what is there to attract him to Greta other than the desire to cuck a villain? And Simmone is such a naive and sheltered girl it almost feels predatory to pursue her. Again, problems that will probably go away once these characters get their stories fleshed out.
Madeline is probably the one I want sexual content for the most, and not just because she's amazingly hot, but out of curiosity re: can Lassie gain her power? I'm less interested in romance with her because so far we haven't seen any soft or romantic facets of her character (which would be very welcome, but obviously we're not going to see those while she's trapped in a dungeon, so I understand why we haven't gotten there yet). But unfortunately due to the centrality of Madeline's power to resolving the core plot, I'm expecting she will be the last or next to last conquest of the main plot (probably next to last before Princess Selena), so we'll likely be waiting until 2024 or later before we get any, uh... Golden Bush, IYKWIM

#wewantgoldenbush