Funny enough I have a problem to filter out the genre I like best. I love magic, in mostly any setting. I love special abilities not connected to magic. I like cute and adorable settings as well as those where the whole world or just the main character's world is broken or dangerous. There are many genres I like to revisit, but it is oftened more about the character than the genre.

If I needed to decide for one thing, I would probably say Historic settings, centered around Industrialization, World Wars, maybe colonization and Renaissance. I like the times, mostly because I like the shifts in living and thoughts and the clash of old and new society structures and the gaps and tensions created by this.

The genre I really do not like (as a gerne) is Romance.  In most cases I do not like to create characters just so they can fall in love and live through a relationship. It is just not my cup of tea.
I admit romance often gets to be part of a good plot - I had more than one character falling deeply in love and if that happens it is a wonderful source to deepen character or even the plot. In this case I really like it, being another aspect of life and making everything feel more rounded.
The one reason I can pinpoint why I do not like Romance for Romance, is that it does not feel like a true "match" if I create a character just to fall in love. I admit there must be more, as for example dark and twisted romances are sometimes okay with me - I just can not really point out what exactly it is.