Honestly besides the bimbo one I pretty much like them all. I mean they're all really fun in their own ways so asking me to pick just one is really hard. Truthfully though I guess my favorite is either magic and or possession, but as i've said I like them all so yeah.
As far as i know, Gender Bender and TG are quite similar. Gender Bending is when you switch from one gender to the other, for example: Male to Female. TG, or Transgender Transformation seems to be mainly the same thing from what I've seen, Male to Female or Female to Male. AP stands for Age Progression which is advancing forward in age, and AR stands for Age Reduction which is getting younger. Hope that helps, friend!