The models (and textures). It's probably a preference thing, but I (my dick) loves the ones used in both FD and Paralogue, and compared to those the Wildlife ones just don't cut it for me.
In fact, to me Paralogue models feel like one of the best 3D porn models, only rivaled by few from Virt-A-Mate I downloaded and keep using everywhere.
It's not about being realistic, if I wanted that I'd just watch porn. There's a fine line in making a 3D porn model between too much realism and too cartoonish, and that's one thing Fallen Doll nailed down.
Which makes it a shame that the author is a greedy f- who decided to turn a sandbox game with excellent models into a gacha multiplayer "game".
I still check on this topic once every few months, but for now I moved to Virt-A-Mate.