I have created some A5 PDF's with various fonts and my favourites are:
3) Book Antiqua
4) Times New Roman
There is hardly any difference between Paletino and Book Antiqua except that Paletino gives slightly larger line spacing which I prefer.
This experiment has only been done by viewing on my pc and printing out on my inkjet. I may find that my preferences change when I actually view them on an iLiad.