I haven't try MangaPlus but may consider it once my current chapter is done. my comic has a manga page style so it'll fit, but I don't know if they will accept my anthro character designs.
I do have 4 chapters of my comic on ArtStreet (by Medibang too).
Update (2024):
Mmm I'm probably not switching to MangaPlus Creator anytime soon unless they have left-to-right reading view.