Well it’s difficult to say which part of the world we are talking about
From my experience (as I’m Polish) - can confirm we kinda like Thrillers/Mysteries, but also it’s quite easy to convince us to try something else, like novels. Especially since Olga Tokarczuk got a Noble Prize last year - loads of my friends now are saying they plan (or already did) read her book. And of course Sapkowski (The Witcher).
While living in London I thought people were not reading this much actually. The ones I knew preferred podcasts or just Netflix TV series.
Now in Switzerland I have a very mixed working environment (Spanish, German, French, Swiss, Polish, Italian…) and it’s hard to say, but I believe the true “Swiss” likes history books (they are damn good at history of their country). I even tried to google what are the the most popular genres/authors there but I think I need to increase a number of my Swiss friends to find out
But I have to say it’s a very interesting question, especially if you try to look from a perspective of person that lives in a country he/she didn’t grow up!