I like using the 188 for almost everything - blush, foundation, highlight. It really helps with applying foundation between the brows, around the nose, the temples and under the eyes. I use the 187 mainly for powders, e.g. msf natural, set powder because I don't have to be so precise. I use it for blush sometimes, after I've applied some with my 129, to diffuse it a bit. I mostly have sheertones, tho, so I'm not worried about a big splotch due to the larger brush coverage. =)