I feel like my favourite is fiction generally and then more specifically fantasy. I love D&D and that type of high fantasy stuff and obviously YA type stories because that's what I lived off when I was younger.
As I've read a wider variety though growing up, I do love a good crime/mystery book. I also don't mind a little romance either but that tends to be more so in the YA books that I read rather than me actually seeking out books specifically in that genre.
I will also read a biography but it has to be one that super, super interests me. I invertedly bought myself a Gary Barlow biography and whilst I don't mind him, it's not at the front of my reading list
One thing I am guilty of is judging a book by its cover too
If the cover is terrible then I am less likely to read you.