I am 118 lbs, 5'4" and ski the Liberty Envy in a 167. It is an AMAZING ski. Super fun in powder, especially good in the trees and yet holds a mean grip on firm snow too. It is indeed really easy to ski.
I love my Envy skis, but I was told by our local retailer (who sold them to me) that I would like the 2018/19 Genesis even better, that they changed a bit for this coming year. I said "how?" and he replied that he'd skied both and that they are very similar but the new one is a little smoother and more powder vs all mountain oriented.
Honestly, I skied all kinds of powder on the Envy over two seasons, from fluffy thigh-deep to deep but heavy first-tracks bliss and all in between. Hard to imagine it getting much better. You can't really go wrong with either one.
However, one consideration may be that the Genesis you are looking at is already shorter than the envy and so the extra tail rocker will likely make it ski even shorter comparatively. You say you like to "rip" so maybe the shorter length will feel less stable at speed? On the other hand it may be compensated by the carbon in it.