I'm a visual person, so I've attached two photos to demonstrate the range of my tastes. As you can see, I like em skinny. But, I'm also down with some chub.
The most important criteria is not weight per se, but facial prettiness and whether she's got an ass or not. I enjoy small, pert model's asses and big phat booties. What I don't like are flat or concave butts. These occur on slim and big girls alike. Breast size doesn't matter to me. Also, the fact that the chubby girl is tied up makes her much more attractive.