For simplicity's sake, let's just assume we're talking about double-jointed dolls here. How do you like your extremities' joints? Some companies just have a solid seam at the elbow and knee, making it so when your doll's limbs are bent, there's a usually thin piece of resin between the piece of arm/leg. Other companies like to have the elbow and knee itself be a part of the double joint, so when you bend the limbs, you have a bump. Others like to have their knees and elbows be solid all the way around, so you have a sort of stripe going along the joint. What is your preference? Personally, I think I'd prefer the elbow/knee to be a solid part of the joint, but taper around the joint, but not where the back of the elbow/knee is molded into the joint itself.