You posted this in the wrong forum, you probably wanted General Discussion. And while I'm at it, my answer is in my signature.
I write it because they are a young member. My favorit member mostly more than 18 years old. Maybe someday I will make them as an oshimen : AKB48 : Fukuoka Seina SKE48 : Obata Yuna NMB48 : Yamamoto Ayaka HKT48 : Oda Ayaka NGT48 : Kusakabe Aina STU48 : Yabushita Fu
AKB: Inagaki Kaori SKE: Kitagawa Yoshino NMB: Jonishi Rei or Yamamoto Ayaka I don't really know the new gens in HKT and NGT well enough to decide (if I did, it would be purely visual decision). Same with D3, although I am starting to get interested in AKB's draftee Honda Sora. As for STU, apart from draftees they only have 1 gen anyways so I don't know if I can consider any of them "new generation", it would be same as just choosing a STU oshi in general.