I have yet to find something that works better than medibang for all around doodling on phones and tablets. However, I'm excited to keep an eye on this as well.
AFAIK Ibis Paint targets Android smartphones, possibply even as their main target. They have various helper tools for finger based drawing and even their tutorial videos are dony by hand on a normal size smartphone (eq. not on an Android tablet with precize pen support).
