It appears to me that the difference between V4 and Genesis is that V$ is rubbish for very tight fitting clothes (unless you haver endless patience at playing with morphs) whilst Genesis is rubbish with loose fitting clothes, in particular long dresses and skirts (even with lots of morphs they never work that well).
As I mostly use Genesis the things I would really like are the things that conforming cannot really do well:
Long and tight “Hollywood glamour” dress flared at the bottom and reaching the floor
Asymmetrical ruffled salsa-type dress or skirt
Women’s blouse with morphs of fully buttoned, part unbuttoned (to cleavage) and open
Wide gown (like the dress in the Santa’s Helpers set but floor length)
And probably too difficult to justify:
Realistic Roman toga