For me, Kylie is worth more than Camila. She has collar content, in a harem, and planned harem content (sporty x taming harem). Camila lacks all of those and there's a possibility that they'll implement an alternative way of adding Camila without having to remove Kylie from the game. So no way I'm giving up a girl that simply has more content.
Anyways, the main issue of the game for me is the lack of content for the girls. By adding more incomplete girls, they're not only neglecting that issue but making it worse. People have different ways of expressing this to them but I wonder if they're noting it down:
-When will you update X?
-When will there be collar content for X?
-Finally more updates for X. It's been a while.
I see those comments from time to time and it's because they add more girls than they could complete. Anyways, I don't think I could add much to what I said. I hope they take it into consideration when planning for future updates.