The PineTab has some of its own unique challenges. The most noticeable one is that the screen only renders in landscape mode and does not auto rotate.
Also, if you would buy the integrated keyboard cover, there is a bug that stops the mouse from moving over the whole screen when using the integrated trackpad. I haven't tried it with an external mouse, so I don't know if it as an issue with the trackpad or a screen issue with the pointer. Of course these bugs are under investigation.
Other than those two, Ubuntu Touch works much the same on the PineTab as on the PinePhone, as @poVoq mentioned.