As a Hongkonger myself, I'd say culturally we are more like Taiwan than Singapore. We don't really see culture influences from Singapore here. I'm not sure if they export any at all. In contrast, we enjoy Taiwan pop songs, TV shows, and movies a lot. And Hong Kong-Taipei has long been one of the world's busiest plane routes[0].

Taiwan's economy is growing, but Singapore definitely benefits most from Hong Kong's downfall. MNCs have already started migrating Asia HQ to Singapore. So I suspect ambitious young professionals, who wish to stay in Asia, will follow the flow of capital and opportunities to Singapore, whereas others will choose Taiwan.

[0] https://www.taiwannews.com.tw/en/news/3422162