At this point, if you're aligned with Liv on the dom route, the only reason not to pick her is that you're not into her looks-wise. Don't get me wrong, Juliette and Dominique are both hot, but they're just teaching you how to torture people. I'm probably in the minority of players who feel bad about how Dom's treating Amara. Juliette could be fun, but for someone who hates Veronica, she relies a lot on her inventions.
Also, after what I learned from this update, I want no part of that Celeste Alessandra threesome, no offense to Alessandra's fine ass, but that bitch is crazy. Alessandra went from no.1 on my desired list to not even a distinct possibility :s.