I gave it a try, the dev continues to improve their art-style, the sprites are even more detailed and there's a bigger focus on making the environment look prettier too with the new top-down perspective.Have you tried the demo of the new game? It's neat. Pretty sure there's a link somewhere in this thread.
Gameplay-wise I have to say I'm more fond of platformers with vertical elements. I was much more of a "megaman" kid than a "legend of zelda" one. There is definitely a bit of a bias since Stella is still a demo while Witch already got all the polish from post-release patches, but I just love how the movement clicks on Flower Witch once you start mastering the game. It borders on frustratingly difficult, but getting fast, clean, and consistent fights against Clarasaphie, and routing a successful path through the Dark Jug's gauntlet were incredibly rewarding gameplay experiences.
I can't comment on the story for Stella since I can't read japanese. I know it is not the focus of any of those games but I did find some lore elements to be interesting so far (what's the time frame between Flower Fairy and Flower Witch? What happened with the other Flower Fairies? Did Kurosane seal Clarasaphie again after her defeat in Flower Fairy, or is her return in Flower Witch simply how long she took to break out of the rubble after she was freed in Flower Fairy? What happened with the Flower Nation? And what made Kurosane swear off from using Flower magic when we can see her younger self was an absolute badass with it?). Also I do think that, even with how few there are, most character interactions are pretty cute, and it is pretty funny that yuri fixations are the main cause of the events that transpire in both games (degenerate siscon Siamia and yandere Marie).