fewers

For an idea of how these cities look here are some drone shots:

Shenzhen: https://www.youtube.com/watch?v=iKLrmi5eOn8

Shanghai: https://www.youtube.com/watch?v=1cC-j4_NtvE

Guangzhou: https://www.youtube.com/watch?v=TNlN1_ANaJs

Chongqing: https://www.youtube.com/watch?v=07dWi-MJReM

Shenyang: https://www.youtube.com/watch?v=QGBSpoTXZmw

Suzhou: https://www.youtube.com/watch?v=4aXLMS-miKU

Dalian: https://www.youtube.com/watch?v=AeEJNNMcR1s

Zhengzhou: https://www.youtube.com/watch?v=KiOlUYfM310

Chengdu: https://www.youtube.com/watch?v=0xwVQ4Jb1zc

There's a fair amount of museums, interesting areas and elaborate buildings in Shenzhen. But it's not like Europe where everything is in one place, it's a huge city. I don't think HK is very strong at public things, except national parks and to some extent transport.

Disliking the mainland is part of Hong Kong's identity. While initially shocking if you go back and forth enough you start appreciating the lesser rules of the mainland and realize that HK is still quite colonial. And while mainlanders won't say "yes sir", or speak English, they are generally quite friendly, curious and genuine. Of course a sense of humor often also helps.