Aiko and Terai Yuki are very similar figures, out of the box, but Aiko has a wider range of morphs and more add-on available -- clothes, textures, etc. I haven't checked recently but I think Aiko LE is still free from DAZ. I have Wardrobe Wizard, so the availability of conforming clothes isn't a major issue for me. If I were deciding which to buy first, I'd put Aiko ahead of TY. None of the three are bad figures, and I reckon that Miki is the most realistic Poser figure currently available.