Now, if I believe that AA is better in playability (only in that) and from my heart I also hope that one day AA3 will come out but I think that many remember it better than AA was because of nostalgia, I say it because I remembered it that way and when I played it again a few months ago it was not the same xD. Now I sincerely believe that KK is one of the best games that has brought out illusion and with this new one it seems that it will be better in almost all aspects than KK1 when it came out.
I respectfully disagree that KK is the best. I have played most of the illusion games, but the only one I keep returning to (and haven't deleted) is AA2. Yes, the character creator is a bit lackluster (even with AAUnlimited), but it still has more personalities and possibilities with them than KK. What do I mean?
In KK, the personalities barely affect the gameplay. There are variations in how the girls say something and the choice you should make in response. On the surface, this seems similar to AA2, but AA2 goes much deeper:
First, in AA you have competition...NPCs are going to try to win and bone your lover/target. Jealousy can also be a major factor (especially with the yandere modules from AAU). You want to build a harem? Well, be careful not to get killed doing so. Hell, once I set-up a school of rapist succubi that would suck out my life and kill me. The goal was to see how many weeks I could survive. It was really fun.
Second, the porn is better. Yes, I said it. KK has better graphics, collisions, more positions, better animations, and some good story-backed fucking for main characters. The problem is none of it is exciting. It's all just too vanilla. Every scene is basically the same: you love each other and have sex...occasionally with some very, very watered-down fetishes. Despite this flaw, those scenes were well-made, but I have no need to ever seen them again. No replayability and it takes a long time to even skip through them.
In AA2, however, even with the limited scenes, the setup can be really interesting. You can be raped, a rapist, cheating with another's lover, cucked, blackmailed/blackmailer, swinging, married (vanilla or spicy), or in a forbidden relationship with your teacher/student(s), etc. This is all on top of being able to incorporate (nearly) any sexual orientation. There is simply extra excitement in those situations in terms of porn content and fetishes that KK just couldn't quite do because of the lack of competition and roles that you can play. KK railroads you into a certain playstyle, while AA2U gives you a lot of freedom.
Finally, I may be in the minority, but I really hated grinding the various sexual positions in order to unlock content/characters. I kept thinking, "how many more times to I gotta fuck this girl's ass now?" I couldn't enjoy the scenes because I just wanted to get through it for the stats. I don't mind the concept, but the increments grew way too slowly.
TL;DR:
I want AA3 (based on AAU) or something similar in terms of gameplay. I really wish I could like KK more...(character creator is sooo good...but gameplay is so repetitive). Don't know much yet about KK2, but I'm a bit sad that it looks to be nothing more than KK with mods incorporated on release.