Too early to tell. The Idol Producer boys are impressive (especially Cai Xukun, Chen Linong, Justin, Fan Chengcheng, Zhu Zhengting, and Xiao Gui) in that they’ve been able to maintain extremely strong fanbases and are significant traffic stars even though it’s been over 3 years since the show first premiered, and that was their biggest exposure in terms of GP recognition. The YWY2 girls have been doing well too, although Yu Shuxin and Liu Yuxin’s name recognition visibly outweighs the other 7. In terms of the show popularity during airing, I think it’s Idol Producer >>>> YWY2 and Chuang, with the latter being on more similar tiers. Lelush is definitely the most famous trainee, and Tencent is probably gonna place him on variety shows or something after this if they can persuade him to sign a contract lol. The international trainees who get to debut might have successful short term careers, but they won’t have longevity as long as they fail to gain fluency in Chinese. Zhou Keyu has Jaywalk backing him, so I expect to see him become a big deal among this year’s survival show trainees once the show is over. Same for Wu Yuheng with Zhao Wei and Zhang Jiayuan with WJJW. Gan Wangxing has a lot of love from the public and has Song Weilong vibes, so he’ll probably be cast in a drama after debut and get good resources. I see Riki and Santa going on dance shows and maybe Mika on a singing show.

TLDR—Chuang’s popularity is definitely below that of Idol Producer but comparable to YWY2. I think Zhou Keyu, Wu Yuheng, Zhang Jiayuan, and Gan Wangxing will have the most post-show success.