I'm a three part torso kind of person. I like the extra joint for further posing. If a doll's body only has two parts, it's 99% likely going to be a deal breaker for me. I will go as far as to ordering an old version of a body or a different company's body for three part. This is also excluding YoSD sizes for my preferences, as I prefer MSDs, and I know YoSD sized dolls seem to work better with only two part (I think, again I'm not into the size haha).