We are very satisfied with the Samsung Galaxy Tab A, but for e-books we have always used the e-reader from Weltbild. Therefore, we cannot answer your question in this regard. In any case, the price-performance ratio is right.
We also did not compare it with the much more expensive Tab S5e.
Readability when surfing the internet is very good, emails, games and other apps work flawlessly and this with a clear, clean picture. Photos are good. So we are satisfied.

Price - performance is very good. Above all, the display is good. And it is also fast enough. Only the memory could be bigger.