Difference betwen this and Anime Assistant from Kovacs?
To me, it seems like this one has a cuter voice (though I can barely understand anything she says), while the Anime Assistant one speaks in an emotionless and soulless text-to-speech voice, which however I can at least understand, plus the dialogues can be fully customised (though when I tried to make it speak Japanese phrases, the pronunciations were off). That's probably the only pro this has, in my opinion. Oh, and this one allows some limited vertical rotation of the character model, so you can just barely sneak a pantsu peek, whereas Anime Assistant only has horizontal rotation.
Functionality wise, Anime Assistant wins easily, though one thing that bothered me is that I could not trigger the animations in that one just by clicking on the character model (unlike this one) and instead had to go to the menu to select those, which is just
a tiny bit inconvenient. Performance wise, Anime Assistant seems to have a much better FPS than this one.
I think Anime Assistant gets my vote.