If you were to use the bottoms hair prop on the top it would be amazing, the hair prop really lets the top option down. The top look older, has a more characterful face and frankly it's a better render, the bottom has a rather deformed left breast and not in a natural way rather a stretched image sort of way, perhaps the top does too but since one is clother and the other isn't i really can't say.
Top:
- older looking, perhaps a better milf in that regard
- more characterful face
- bad hair prop (relatively, i've seen worse but it's not as good as in the lower option)
Bottom:
- younger looking, less of a milf
- more generic looking, though the pose looks too close into the camera for such a blank expression, add a slight smile and i suspect she will seem less generic, it;s surprising how a little posing raises a figure from "meh", to decent
- better hair prop by far IMO because it looks more like real hair and the colour has more depth
If you have to pick one i'd go top but only just, try mixing the two a little, or at least switching hair props and clothing the bottom one for a better comparison.
