I enjoy reading most genres. Everything but contemporary romance - I can do romance from other time periods or places, but, for some reason, I struggle to invest myself in those particular romances. Also, although I enjoy reading "high" fantasy, I have not read tons of it, so I would probably not be a great editor there. I'll try anything once, though! My heart belongs to the YA/NA genre as well as fantasy. If you can mesh the two, you're my dream read.
I lean towards the longer book - I enjoy complexity in character and plot. Given the choice, I'm cracking open a doorstop of a novel. Not to say that I don't also enjoy an 80, 000 worder, it's just not what I gravitate towards on the shelf.