I honestly don't have any real rhyme or reason for choosing which book to read next, with one caveat. If I start reading a series and I REALLY like it... I tend to read several (if not all) the books in the series. I binge read just like I binge watch TV series. I had checked out Outlander from the library...over the next weeks, I had read every book in the series. Now I'm caught waiting...sigh.
I'm currently listening to books in Mercedes Lackey's Valdemar universe - I started with the The Collegium Chronicles and am almost finished with those (I'm on the next to the last one).
When I finish these? Who knows... I have bought several books recently. It will be the one that catches my eye at the moment :-)
What about you?