I like variety, from nubile to mature, petite to BBW, small bust, large bust, and so on. Beauty in the female form comes in all shapes and sizes.
If I had to pick a preference, it would be the body type most often known as the "spinner," or "spin fuck" - petite, under five-feet in height, tiny and tight. The majority of my affair partners have fallen into that category. My most cherished affair partner, Bev, was 4'-8" tall, 88-pounds soaking wet, B-cup, like a little sex doll, sculpted, a perfect spinner.