Tested a few note taking apps with stylus on the P12 tablet.
DrawNote, has a wide range of functions including note taking / todo / mindmap. The only concern is that it does not support pressure sensing. Overall best choice in terms of ease of use.
Nebo, restricted to note taking. My main concern is that while Lenovo has a preinstalled premium version, there are reports that it might give you data loss during system updates. Stability is my main concern so I did not continue using it.
ButterFly, open-source cross-platform app and even supports pressure sensing. Main drawback is that it does not provide a polished experience.
FreeNote, really has all functionalities that I could imagine. However, the developer does not provide clear pricing models. Instead, they send out "free-for-life VIPs" once in a while, which is quite questionable practice to me.